During World War II, Japan occupies the Aleutian Islands in the Alaskan north.

Joseph Persico's book "11th Hour, 11th Day, 11th Month" tells of a needlessly gory end to that war.

The invasion of Okinawa.

The First Infantry Division, aka Big Red One, of the U.S. Army; decorated veterans from the Big Red One during World War II reflect on tense battlefields of El Guettar, North Africa, Troina, Sicily and Normandy (Omaha beach.).

During World War II, Japan occupies the Aleutian Islands in the Alaskan north.

A massive artillery strike signals the start of Operation Cobra.

Contestants test their skills with the Black Widow long bow; two contestants must adapt to the revolutionary Gatling gun to stay in the game.

Paid programming.

Gold has been the best long-term asset class for thousands of years. Find out how you can protect your financial future by diversifying your nest-egg with physical Gold today.

Paid programming.

The Horsepower Scrubber is the waterproof, cordless and rechargeable motorized power scrubber that'll make cleaning everything in and around your home a breeze. With 5 interchangeable heads it's customizable to tackle any task!

Paid programming.

Even if YOU do everything right to protect yourself, company and institutional data breaches are out of your control. Nearly 1 out of 4 US consumers have been a victim of identity theft. Find out how LifeLock can help protect your identity.

Paid programming.

Save thousands on car repairs.

The First Infantry Division, aka Big Red One, of the U.S. Army; decorated veterans from the Big Red One during World War II reflect on tense battlefields of El Guettar, North Africa, Troina, Sicily and Normandy (Omaha beach.).

During World War II, Japan occupies the Aleutian Islands in the Alaskan north.

A massive artillery strike signals the start of Operation Cobra.

Contestants test their skills with the Black Widow long bow; two contestants must adapt to the revolutionary Gatling gun to stay in the game.

Joseph Persico's book "11th Hour, 11th Day, 11th Month" tells of a needlessly gory end to that war.

The invasion of Okinawa.

The First Infantry Division, aka Big Red One, of the U.S. Army; decorated veterans from the Big Red One during World War II reflect on tense battlefields of El Guettar, North Africa, Troina, Sicily and Normandy (Omaha beach.).

During World War II, Japan occupies the Aleutian Islands in the Alaskan north.

A massive artillery strike signals the start of Operation Cobra.

Contestants test their skills with the Black Widow long bow; two contestants must adapt to the revolutionary Gatling gun to stay in the game.

The German counteroffensive, the Battle of the Bulge, put U.S. Gen. Omar Bradley and Hitler's Field Marshal Walter Model into direct confrontation.

Military planners move millions of soldiers and tons of cargo halfway around the world and into the thick of action.

The next generation of combat aircraft includes the U.S. F-22 and F-35, the Eurofighter Typhoon, the Russian Su-35 and Su-37, and China's Chengdu J-10.

Nomadic American Indians' motivation, tactics, weapons and experiences.

The HMT Rohna's sinking in 1943 marks the greatest loss at sea of U.S. Army personnel in World War II.

The next generation of combat aircraft includes the U.S. F-22 and F-35, the Eurofighter Typhoon, the Russian Su-35 and Su-37, and China's Chengdu J-10.

Nomadic American Indians' motivation, tactics, weapons and experiences.

The HMT Rohna's sinking in 1943 marks the greatest loss at sea of U.S. Army personnel in World War II.

The German counteroffensive, the Battle of the Bulge, put U.S. Gen. Omar Bradley and Hitler's Field Marshal Walter Model into direct confrontation.

Military planners move millions of soldiers and tons of cargo halfway around the world and into the thick of action.

Even if YOU do everything right to protect yourself, company and institutional data breaches are out of your control. Nearly 1 out of 4 US consumers have been a victim of identity theft. Find out how LifeLock can help protect your identity.

Connie Craig-Carrol & Founder Ken Meares investigates Omega XL, the ultimate all-natural solution for joint pain from inflammation.

Paid programming.

Save thousands on car repairs.

Paid programming.

Gold has been the best long-term asset class for thousands of years. Find out how you can protect your financial future by diversifying your nest-egg with physical Gold today.

Nomadic American Indians' motivation, tactics, weapons and experiences.

The HMT Rohna's sinking in 1943 marks the greatest loss at sea of U.S. Army personnel in World War II.

The German counteroffensive, the Battle of the Bulge, put U.S. Gen. Omar Bradley and Hitler's Field Marshal Walter Model into direct confrontation.

Military planners move millions of soldiers and tons of cargo halfway around the world and into the thick of action.

The next generation of combat aircraft includes the U.S. F-22 and F-35, the Eurofighter Typhoon, the Russian Su-35 and Su-37, and China's Chengdu J-10.

Nomadic American Indians' motivation, tactics, weapons and experiences.

The HMT Rohna's sinking in 1943 marks the greatest loss at sea of U.S. Army personnel in World War II.

The German counteroffensive, the Battle of the Bulge, put U.S. Gen. Omar Bradley and Hitler's Field Marshal Walter Model into direct confrontation.

Military planners move millions of soldiers and tons of cargo halfway around the world and into the thick of action.

Vice Adm. William Halsey battles Vice Adm. Takeo Kurita over Leyte Gulf.

Thousands of Marines hit the beaches of the coral island of Peleliu.

German and Soviet soldiers clash in the city of Stalingrad for nearly six months in 1942 and 1943.

The German Afrika Korps pushes the British army back from Libya to a railway stop called El Alamein.

The final four contestants compete to determine the winner of the $100,000 prize.

A carefully planned raid frees 500 soldiers from a Japanese POW camp.

German and Soviet soldiers clash in the city of Stalingrad for nearly six months in 1942 and 1943.

The German Afrika Korps pushes the British army back from Libya to a railway stop called El Alamein.

The final four contestants compete to determine the winner of the $100,000 prize.

A carefully planned raid frees 500 soldiers from a Japanese POW camp.

Vice Adm. William Halsey battles Vice Adm. Takeo Kurita over Leyte Gulf.

Thousands of Marines hit the beaches of the coral island of Peleliu.

Even if YOU do everything right to protect yourself, company and institutional data breaches are out of your control. Nearly 1 out of 4 US consumers have been a victim of identity theft. Find out how LifeLock can help protect your identity.

Gold has been the best long-term asset class for thousands of years. Find out how you can protect your financial future by diversifying your nest-egg with physical Gold today.

Paid programming.

Paid programming.

Alec and Kaleb interview patients and their families, and how their lives have been changed because of the life-changing pediatric specialty care they received at Shriners Hospitals for Children®.

The final four contestants compete to determine the winner of the $100,000 prize.

A carefully planned raid frees 500 soldiers from a Japanese POW camp.

Vice Adm. William Halsey battles Vice Adm. Takeo Kurita over Leyte Gulf.

Thousands of Marines hit the beaches of the coral island of Peleliu.

German and Soviet soldiers clash in the city of Stalingrad for nearly six months in 1942 and 1943.

The German Afrika Korps pushes the British army back from Libya to a railway stop called El Alamein.

The final four contestants compete to determine the winner of the $100,000 prize.

A carefully planned raid frees 500 soldiers from a Japanese POW camp.

Vice Adm. William Halsey battles Vice Adm. Takeo Kurita over Leyte Gulf.

Thousands of Marines hit the beaches of the coral island of Peleliu.

Gen. Sir Edmund "Bull" Allenby meets Gen. Otto Liman von Sanders at World War I's Battle of Megiddo.

Passengers aboard the president's Boeing 747 jet make a 20,000-mile odyssey into the heart of Africa; preparing for an international mission; a top Air Force team mans the cockpit.

The historical events that spawned the self-proclaimed Islamic State (ISIS), one of the world's most feared terrorist organizations; interviews with U.S. policymakers, generals and intelligence officers as well as an interview with an ISIS recruit.

The Taliban's jihad comes to Kabul and the streets of New York.

The revolt at Mazar-e-Sharif is the deadliest battle in the war in Afghanistan.

The historical events that spawned the self-proclaimed Islamic State (ISIS), one of the world's most feared terrorist organizations; interviews with U.S. policymakers, generals and intelligence officers as well as an interview with an ISIS recruit.

The Taliban's jihad comes to Kabul and the streets of New York.

The revolt at Mazar-e-Sharif is the deadliest battle in the war in Afghanistan.

Gen. Sir Edmund "Bull" Allenby meets Gen. Otto Liman von Sanders at World War I's Battle of Megiddo.

Passengers aboard the president's Boeing 747 jet make a 20,000-mile odyssey into the heart of Africa; preparing for an international mission; a top Air Force team mans the cockpit.

Save thousands on car repairs.

Connie Craig-Carrol & Founder Ken Meares investigates Omega XL, the ultimate all-natural solution for joint pain from inflammation.

Even if YOU do everything right to protect yourself, company and institutional data breaches are out of your control. Nearly 1 out of 4 US consumers have been a victim of identity theft. Find out how LifeLock can help protect your identity.

Regain independence and enjoy greater mobility with the compact design and long-lasting battery of portable oxygen.

The Taliban's jihad comes to Kabul and the streets of New York.

The revolt at Mazar-e-Sharif is the deadliest battle in the war in Afghanistan.

Gen. Sir Edmund "Bull" Allenby meets Gen. Otto Liman von Sanders at World War I's Battle of Megiddo.

Passengers aboard the president's Boeing 747 jet make a 20,000-mile odyssey into the heart of Africa; preparing for an international mission; a top Air Force team mans the cockpit.

The historical events that spawned the self-proclaimed Islamic State (ISIS), one of the world's most feared terrorist organizations; interviews with U.S. policymakers, generals and intelligence officers as well as an interview with an ISIS recruit.

The Taliban's jihad comes to Kabul and the streets of New York.

The revolt at Mazar-e-Sharif is the deadliest battle in the war in Afghanistan.

Gen. Sir Edmund "Bull" Allenby meets Gen. Otto Liman von Sanders at World War I's Battle of Megiddo.

Passengers aboard the president's Boeing 747 jet make a 20,000-mile odyssey into the heart of Africa; preparing for an international mission; a top Air Force team mans the cockpit.

African American soldiers who served in World War II receive the Medal of Honor for valor only recently.

The African American contribution to the Normandy invasion.

U.S. Marines and civilians find themselves under attack from Japan on a tiny Pacific island.

A documentary reveals secrets and little-known details of FDR's reactions in the earliest hours after the Japanese attacks on Oahu.

U.S. Marines and civilians find themselves under attack from Japan on a tiny Pacific island.

A documentary reveals secrets and little-known details of FDR's reactions in the earliest hours after the Japanese attacks on Oahu.

African American soldiers who served in World War II receive the Medal of Honor for valor only recently.

The African American contribution to the Normandy invasion.

Promote Energy, vitality & Focus during the day and relaxation, deep sleep and restoration at night. MyMagnesium absorbs significantly better than generic magnesium.

Connie Craig-Carrol & Founder Ken Meares investigates Omega XL, the ultimate all-natural solution for joint pain from inflammation.

Save thousands on car repairs.

Even if YOU do everything right to protect yourself, company and institutional data breaches are out of your control. Nearly 1 out of 4 US consumers have been a victim of identity theft. Find out how LifeLock can help protect your identity.

A documentary reveals secrets and little-known details of FDR's reactions in the earliest hours after the Japanese attacks on Oahu.

African American soldiers who served in World War II receive the Medal of Honor for valor only recently.

The African American contribution to the Normandy invasion.

U.S. Marines and civilians find themselves under attack from Japan on a tiny Pacific island.

A documentary reveals secrets and little-known details of FDR's reactions in the earliest hours after the Japanese attacks on Oahu.

African American soldiers who served in World War II receive the Medal of Honor for valor only recently.

The African American contribution to the Normandy invasion.

American troops recount brutal shootouts and barrages from RPGs on the road to capturing Baghdad in 2003.

The Japanese midget sub that started World War II in the Pacific rests 1,200 feet under the waters outside Pearl Harbor.

The Knights of St. John defend Malta from attacking Ottoman Turks in one of history's greatest sieges and the last battle of the Crusades in 1565.

The USS Texas is the last battleship afloat that was involved in WWI and WWII.

The success or failure of the invasion rests on the efforts of ordinary people.

The Knights of St. John defend Malta from attacking Ottoman Turks in one of history's greatest sieges and the last battle of the Crusades in 1565.

The USS Texas is the last battleship afloat that was involved in WWI and WWII.

The success or failure of the invasion rests on the efforts of ordinary people.

American troops recount brutal shootouts and barrages from RPGs on the road to capturing Baghdad in 2003.

The Japanese midget sub that started World War II in the Pacific rests 1,200 feet under the waters outside Pearl Harbor.

Gold has been the best long-term asset class for thousands of years. Find out how you can protect your financial future by diversifying your nest-egg with physical Gold today.

Paid programming.

Connie Craig-Carrol & Founder Ken Meares investigates Omega XL, the ultimate all-natural solution for joint pain from inflammation.

Paid programming.

Tune in now to get today's exclusive TV offer you can't find in stores.

Even if YOU do everything right to protect yourself, company and institutional data breaches are out of your control. Nearly 1 out of 4 US consumers have been a victim of identity theft. Find out how LifeLock can help protect your identity.

Paid programming.

The success or failure of the invasion rests on the efforts of ordinary people.

American troops recount brutal shootouts and barrages from RPGs on the road to capturing Baghdad in 2003.

The Japanese midget sub that started World War II in the Pacific rests 1,200 feet under the waters outside Pearl Harbor.

The Knights of St. John defend Malta from attacking Ottoman Turks in one of history's greatest sieges and the last battle of the Crusades in 1565.

The USS Texas is the last battleship afloat that was involved in WWI and WWII.

The success or failure of the invasion rests on the efforts of ordinary people.

American troops recount brutal shootouts and barrages from RPGs on the road to capturing Baghdad in 2003.

The Japanese midget sub that started World War II in the Pacific rests 1,200 feet under the waters outside Pearl Harbor.

How the Pathfinders factored into D-Day and other battles of World War II, including North Africa and the Battle of the Bulge.

Born in the military, tanks, satellites and parachutes find useful and exciting applications in civilian life.

American pilots of the Cactus Air Force match skills and instincts with top Japanese aces as they battle in the skies above Guadalcanal.

A Soviet semi-automatic rifle used in the 1941 Nazis invasion; a tactical OBR with 20 rounds of magazines; the Milkor M32A1 grenade launcher; an FNFAL self-loading selective fire battle rifle; a mortar-rigged barbed wire fence.

San Diego's Strategic Operations Training Center; guns and gear used by the Red Coats used against American rebels in the War of Independence.

The contestants' archery skills are put to the test with a modern compound bow; tubular team challenge; tensions with team leadership threaten to unravel the group.

American pilots of the Cactus Air Force match skills and instincts with top Japanese aces as they battle in the skies above Guadalcanal.

A Soviet semi-automatic rifle used in the 1941 Nazis invasion; a tactical OBR with 20 rounds of magazines; the Milkor M32A1 grenade launcher; an FNFAL self-loading selective fire battle rifle; a mortar-rigged barbed wire fence.

San Diego's Strategic Operations Training Center; guns and gear used by the Red Coats used against American rebels in the War of Independence.

The contestants' archery skills are put to the test with a modern compound bow; tubular team challenge; tensions with team leadership threaten to unravel the group.

How the Pathfinders factored into D-Day and other battles of World War II, including North Africa and the Battle of the Bulge.

Born in the military, tanks, satellites and parachutes find useful and exciting applications in civilian life.

Even if YOU do everything right to protect yourself, company and institutional data breaches are out of your control. Nearly 1 out of 4 US consumers have been a victim of identity theft. Find out how LifeLock can help protect your identity.

The Horsepower Scrubber is the waterproof, cordless and rechargeable motorized power scrubber that'll make cleaning everything in and around your home a breeze. With 5 interchangeable heads it's customizable to tackle any task!

Gold has been the best long-term asset class for thousands of years. Find out how you can protect your financial future by diversifying your nest-egg with physical Gold today.

Paid programming.

Tune in now to get today's exclusive TV offer you can't find in stores.

Promote Energy, vitality & Focus during the day and relaxation, deep sleep and restoration at night. MyMagnesium absorbs significantly better than generic magnesium.

San Diego's Strategic Operations Training Center; guns and gear used by the Red Coats used against American rebels in the War of Independence.

The contestants' archery skills are put to the test with a modern compound bow; tubular team challenge; tensions with team leadership threaten to unravel the group.

How the Pathfinders factored into D-Day and other battles of World War II, including North Africa and the Battle of the Bulge.

Born in the military, tanks, satellites and parachutes find useful and exciting applications in civilian life.

American pilots of the Cactus Air Force match skills and instincts with top Japanese aces as they battle in the skies above Guadalcanal.

A Soviet semi-automatic rifle used in the 1941 Nazis invasion; a tactical OBR with 20 rounds of magazines; the Milkor M32A1 grenade launcher; an FNFAL self-loading selective fire battle rifle; a mortar-rigged barbed wire fence.

San Diego's Strategic Operations Training Center; guns and gear used by the Red Coats used against American rebels in the War of Independence.

The contestants' archery skills are put to the test with a modern compound bow; tubular team challenge; tensions with team leadership threaten to unravel the group.

How the Pathfinders factored into D-Day and other battles of World War II, including North Africa and the Battle of the Bulge.

Born in the military, tanks, satellites and parachutes find useful and exciting applications in civilian life.

U.S. Navy Seabees build and fight.

Examining evidence that Japan built and tested its own atomic bomb during World War II to be delivered by submarine-borne aircraft.

The submarine USS Bowfin makes nine patrol runs during World War II.

British paratroopers the Red Devils have orders to hold their positions after the German army surrounds them.

Hurlburt Field Air Force Base in Florida; Air Force Special Operations; training to detect car bombs and explosives; AC-130 heavily armed plane.

Head-to-head speed-shooting showdown; the contestants get surprise visitors to help train.

The submarine USS Bowfin makes nine patrol runs during World War II.

British paratroopers the Red Devils have orders to hold their positions after the German army surrounds them.

Hurlburt Field Air Force Base in Florida; Air Force Special Operations; training to detect car bombs and explosives; AC-130 heavily armed plane.

Head-to-head speed-shooting showdown; the contestants get surprise visitors to help train.

U.S. Navy Seabees build and fight.

Examining evidence that Japan built and tested its own atomic bomb during World War II to be delivered by submarine-borne aircraft.

Promote Energy, vitality & Focus during the day and relaxation, deep sleep and restoration at night. MyMagnesium absorbs significantly better than generic magnesium.

RotoRazer is the world's greatest jigsaw, circular saw, band saw, tile saw and hacksaw all-in-one amazing easy to use tool!

Connie Craig-Carrol & Founder Ken Meares investigates Omega XL, the ultimate all-natural solution for joint pain from inflammation.

Even if YOU do everything right to protect yourself, company and institutional data breaches are out of your control. Nearly 1 out of 4 US consumers have been a victim of identity theft. Find out how LifeLock can help protect your identity.

Paid programming.

Hurlburt Field Air Force Base in Florida; Air Force Special Operations; training to detect car bombs and explosives; AC-130 heavily armed plane.

Head-to-head speed-shooting showdown; the contestants get surprise visitors to help train.

U.S. Navy Seabees build and fight.

Examining evidence that Japan built and tested its own atomic bomb during World War II to be delivered by submarine-borne aircraft.

The submarine USS Bowfin makes nine patrol runs during World War II.

British paratroopers the Red Devils have orders to hold their positions after the German army surrounds them.

Hurlburt Field Air Force Base in Florida; Air Force Special Operations; training to detect car bombs and explosives; AC-130 heavily armed plane.

Head-to-head speed-shooting showdown; the contestants get surprise visitors to help train.

U.S. Navy Seabees build and fight.

Examining evidence that Japan built and tested its own atomic bomb during World War II to be delivered by submarine-borne aircraft.

Vietnam War forward-air controllers direct jet bombers toward target.

Exploring how modern military innovations stem from ancient Chinese inventions like gunpowder and automated crossbows.

A U.S. major (Rick Schroder) leads his men against the odds when they become trapped behind enemy lines in World War I.

Despite the worst weather in 20 years, Patton's Third Army races north to smash through German lines and relieve besieged Americans defending Bastogne, Belgium, during the Battle of the Bulge.

The USS New Jersey, a notable battleship, assisted in both World War II and the Korean War.

A U.S. major (Rick Schroder) leads his men against the odds when they become trapped behind enemy lines in World War I.

Despite the worst weather in 20 years, Patton's Third Army races north to smash through German lines and relieve besieged Americans defending Bastogne, Belgium, during the Battle of the Bulge.

The USS New Jersey, a notable battleship, assisted in both World War II and the Korean War.

U.S. Marines and civilians find themselves under attack from Japan on a tiny Pacific island.

Paid programming.

Connie Craig-Carrol & Founder Ken Meares investigates Omega XL, the ultimate all-natural solution for joint pain from inflammation.

Even if YOU do everything right to protect yourself, company and institutional data breaches are out of your control. Nearly 1 out of 4 US consumers have been a victim of identity theft. Find out how LifeLock can help protect your identity.

Paid programming.

Despite the worst weather in 20 years, Patton's Third Army races north to smash through German lines and relieve besieged Americans defending Bastogne, Belgium, during the Battle of the Bulge.

The USS New Jersey, a notable battleship, assisted in both World War II and the Korean War.

U.S. Marines and civilians find themselves under attack from Japan on a tiny Pacific island.

For the science and psychology behind some of the greatest shots in military history, snipers deconstruct their missions, ranging from Vietnam to Iraq and Afghanistan; a Canadian sniper recounts hitting a Taliban fighter from 1.5 miles away.

Despite the worst weather in 20 years, Patton's Third Army races north to smash through German lines and relieve besieged Americans defending Bastogne, Belgium, during the Battle of the Bulge.

The USS New Jersey, a notable battleship, assisted in both World War II and the Korean War.

U.S. Marines and civilians find themselves under attack from Japan on a tiny Pacific island.

Aircraft carriers; supertankers; container vessels; armored vehicles; flight-simulation technology. Host: Hunter Ellis.

The 10th Mountain Division, trained for winter warfare; gun-sights; high-altitude military and NASA craft based on glider technology.

Personalities, weapons, firepower and leadership of the battle of Iwo Jima.

The USS Laffey was actually two World War II ships with the same name: DD-459, which fought to the death at Guadalcanal in 1942; and DD-724, which earned the nickname "The Ship That Would Not Die" during a Japanese kamikaze attack.

From the Arctic Circle to deserts and jungles, Allied soldiers were exposed to diverse terrain and climate during World War II.

After defeating Gen. George Washington's rebel forces in the Battle of Long Island in 1776, British Gen. William Howe occupies strategic New York City.

Personalities, weapons, firepower and leadership of the battle of Iwo Jima.

The USS Laffey was actually two World War II ships with the same name: DD-459, which fought to the death at Guadalcanal in 1942; and DD-724, which earned the nickname "The Ship That Would Not Die" during a Japanese kamikaze attack.

From the Arctic Circle to deserts and jungles, Allied soldiers were exposed to diverse terrain and climate during World War II.

After defeating Gen. George Washington's rebel forces in the Battle of Long Island in 1776, British Gen. William Howe occupies strategic New York City.

Aircraft carriers; supertankers; container vessels; armored vehicles; flight-simulation technology. Host: Hunter Ellis.

The 10th Mountain Division, trained for winter warfare; gun-sights; high-altitude military and NASA craft based on glider technology.

Paid programming.

Even if YOU do everything right to protect yourself, company and institutional data breaches are out of your control. Nearly 1 out of 4 US consumers have been a victim of identity theft. Find out how LifeLock can help protect your identity.

Connie Craig-Carrol & Founder Ken Meares investigates Omega XL, the ultimate all-natural solution for joint pain from inflammation.

Paid programming.

From the Arctic Circle to deserts and jungles, Allied soldiers were exposed to diverse terrain and climate during World War II.

After defeating Gen. George Washington's rebel forces in the Battle of Long Island in 1776, British Gen. William Howe occupies strategic New York City.

Aircraft carriers; supertankers; container vessels; armored vehicles; flight-simulation technology. Host: Hunter Ellis.

The 10th Mountain Division, trained for winter warfare; gun-sights; high-altitude military and NASA craft based on glider technology.

Personalities, weapons, firepower and leadership of the battle of Iwo Jima.

The USS Laffey was actually two World War II ships with the same name: DD-459, which fought to the death at Guadalcanal in 1942; and DD-724, which earned the nickname "The Ship That Would Not Die" during a Japanese kamikaze attack.

From the Arctic Circle to deserts and jungles, Allied soldiers were exposed to diverse terrain and climate during World War II.

After defeating Gen. George Washington's rebel forces in the Battle of Long Island in 1776, British Gen. William Howe occupies strategic New York City.

Aircraft carriers; supertankers; container vessels; armored vehicles; flight-simulation technology. Host: Hunter Ellis.

The 10th Mountain Division, trained for winter warfare; gun-sights; high-altitude military and NASA craft based on glider technology.