sentences:  During World War II, its predecessor unit, the 398th Bombardment Group (Heavy) was an Eighth Air Force B-17 Flying Fortress unit in England, stationed at RAF Nuthampstead.The group flew 195 combat missions, the last being on 25 April 1945.The group was constituted as the 398th Bombardment Group (Heavy) on 15 February 1943, and equipped with the B-17 Flying Fortress.