US Subs patrolled the world's oceans, including the Vietnam coastline. Other than possibly any covert operations, US submarines just patrolled, and kept an eye on any Soviet subs working in the South China Sea (Vietnamese Coastline).
No, not really, submarines were first used successfully in the Civil War.
Yes, submarines were used by the Confederate Navy in the US Civil War.
World War I submarines were primarily used to locate and attack surface cargo and warships.
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Nuclear weapons were not used in the Vietnam War.
Both the Union and the Confederate had submarines, but the Confederate used them more often.
periscopes are used for submarines and war tanks
They were used in the first world war in submarines. The are used now also for submarines and also war tanks. The outer coating of the periscope for the submarines were firm and waterproof for protection from the water pressure. As for the war tank the periscope is able to turn 360 degrees.
They were used by submarines to navigate when not in open waters, They were also used by submarines and anti-submarine ships to locate enemy submarines.
submarines were used in WW1 and the weapons used were torpedos and a deck gun.
Revolutionary War 1776.
Atlantic Ocean.