The 505th Bombardment Group is an inactive United States Air Force unit. Its last assignment was with Thirteenth Air Force, stationed at Clark Field, Philippines. It was inactivated on 30 June 1946. The unit served primarily in the Pacific Ocean theater of World War II as part of Twentieth Air Force. The 505th Bomb Group's aircraft engaged in B-29 Superfortress bombardment operations against Japan. Its aircraft were identified by a "K" (January to March 1945) or "W" (April to September 1945) inside a Circle painted on the tail.