Explanation of the basic principles of torsion bar suspension. The vehicle suspension uses a torsion bar as the main weight bearing spring. United States tank destroyer 3-inch Gun Motor Carriage (GMC) M10 and 76 mm Gun Motor Carriage M-18 tank destroyer move along an uneven terrain. M-10 uses spring type suspension and M-18 uses torsion bar suspension. A man uses a model to describe the principles of torsion bar suspension used on army track vehicles. He uses a plain piece and a simple model for demonstration of principles. The bar's torsion resistance is demonstrated. Torsion bar and suspension bar are explained by the model.
U.S. soldier with shouldered rifle stands guard beside the Rio Grande river, separating the United States from Mexico, in 1913. A dog stands next to him. The river is rushing in the background. View of extensive stakes and barbed wire lining the U.S.Mexico border. U.S. soldiers perform changing of the guard at a checkpoint on the U.S. side of the border between the U.S. and Mexico. Two new American sentries replace those being relieved. Signs on the fence identify the respective country boundaries. Mexican refugees (mostly women and children) flee the revolutionary combat taking place in Mexico. U.S. soldiers monitor as they cross into the United States, and direct some passing inside a trench manned by American soldiers along the border. Scene shifts to an official looking building guarded by U.S. soldiers. Several Mexican men, including Pancho Villa leave the building, accompanied by two or more Americans. (One American, wearing glasses , and carrying a cane. is dressed in a white suit, and wears a bow tie and Edwardian style summer straw hat. Next, Pancho Villa is seen with a number of his soldiers. A group of Mexican men relaxing at a shaded table near rustic structures. Large cacti frame the foreground, where a girl is walking toward them. Closeup of the men gathered around the table.
The U.S. aircrafts lands after the Vietnam Carrier Air Strike in South China Sea on the deck of USS Hancock CV-19, Pacific Ocean. U.S. A-1H Skyraider makes a recovery. Plane taxies forward, aircraft folds its wings. U.S. A-1H Skyraider lands. U.S. A-1H Skyraider on a fly back taking a wave off. U.S. A-1H Skyraider on the deck after landing. Damage to the side of U.S. A-1H Skyraider. A hole in its fuselage.
U.S. troops' invasion on the Marshall Islands and destruction of Japanese garrisons during World War II. An animated map depicts the location of Marshall Islands in the South East Asia. U.S. Navy ships proceed in order to take the island from their enemies. The animated map depicts the tactics of U.S. Navy. The soldiers attack the Kwajalein Island. Roi and Namur in the north are attacked by the U.S. Marines. The U.S. fighter aircraft. Soldiers in small boats approach towards the Marshall Islands. Aerial bombarding on the island by the U.S. fighter aircraft. The American soldiers take their positions on the island's coast. Soldiers with their weapons. An officer examines the bomb explosion through binoculars. The remains of a destroyed Japanese aircraft. American soldiers capture the Japanese base headquarter. The dead Japanese soldiers. The arrival of more American troops on the island.
U.S. troops battle North Koreans in Taejon, Korea during the Korean War. U.S. 25th Infantry Division troops fire howitzers, bazookas and other artillery weapons at North Korean positions. U.S. tanks fire at enemy positions. Smoke rises from enemy positions on hills. A U.S. aircraft bombs enemy positions. U.S. troops cover a bridge with rifle and machine gun fire to help the last units to cross a river near Yongdon. Men in a jeep fire guns as it goes across a bridge. United Nations flag flies from a pole at U.S. 24th Division Regimental Command Post in Chinju. North Korean prisoners are rounded up at the command post as South Korean troops move up to aid the defense. Trucks tow camouflage artillery guns up a hill. 25th Division infantrymen advance and recover their vehicles.
USS Coral Sea underway in the Gulf of Tonkin during Vietnam War. USS Coral Sea, an aircraft carrier underway in the Gulf of Tonkin. U.S. Navy A-4E aircraft comes in for landing aboard USS Coral Sea. A-1J aircraft in a landing pattern as it is being recovered aboard. U.S. Navy A-1H aircraft takes a wave off over the deck of the aircraft carrier. U.S. Navy RF-8A aircraft comes in for landing and lands on the deck. U.S. Navy A-1J and C-2A also come in and land one by one. Two U.S. Navy F-4B aircraft land on the deck of the carrier. Aerial view of a destroyer escort underway at sea. A destroyer underway at sea. U.S. Navy KA-3B flies over the wake of USS Coral Sea. Another KA-3B aircraft comes in and lands at the deck.
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