Flying Tigers

The First American Volunteer Group of the Republic of China Air Force, nicknamed the Flying Tigers, was formed to help oppose the Japanese invasion of China. Operating in 1941–1942, it was composed of pilots from the United States Army Air Corps, Navy, and Marine Corps, and was commanded by Claire Lee Chennault. Their Curtis P-40B Warhawk aircraft, marked with Chinese colors, flew under American control. Recruited under President Franklin Roosevelt's authority before Pearl Harbor, their mission was to bomb Japan and defend the Republic of China, but many delays meant the AVG first flew in combat after the US and Japan declared war.

The group consisted of three fighter squadrons of around 30 aircraft each that trained in Burma before the American entry into World War II to defend Republic of China against Japanese forces. The AVG were officially members of the Republic of China Air Force.

Source: Wikipedia