What country occupied Vietnam during World War 2?

Answer 1

During WWII, Japan occupied it. Japanese land based bombers were launched from one of, possibly, the airfields in the former "South" Vietnam to attack and sink the British battleship HMS Prince of Wales and battlecruiser HMS Repulse on 10 December 1941. This attack, was the first time in history that any battleship had been sunk solely by airpower; while at sea and underway.

This action dispelled all further arguments about the superiority of airpower over the battleship. Prior to the December 10th attack, naval officers world wide had argued that the sinkings of the battleships at Toranto, Pearl Harbor, and General Billy Mitchell's test bombings in the 1920's, were INVALID as the battleship's were "sitting ducks"; not moving & and not fighting back.

HMS Prince of Wales and HMS Repulse were moving and fighting back; they were sunk by airplanes.

Lastly: During the course of the French Indochina War/1st Indochina War (1946-1954) the French utilized captured WWII Japanese Type 95 light tanks for both training and combat operations. Photographs of those Type 95 light tanks can be seen in Dunnigan's book, "Armor In Vietnam."

Answer 2

France.
France

Answer 3

Japan occupied Indochina during WWII.