 It returned to Hawaii in 1944 for training and reentered combat from Okinawa in 1945.After V-J Day, the squadron returned to the United States and was inactivated.The squadron was first activated at Charleston Army Air Field, South Carolina in October 1942 as the 521st Bombardment Squadron, one of the original squadrons of the 378th Bombardment Group, located at Langley Field, Virginia.