The 491st Bombardment Group is a former United States Army Air Forces unit. It was activated in October 1943 as a heavy bomber unit, drawing its cadre from the former 17th Antisubmarine Squadron. After training in the United States, the group deployed to the European Theater of Operations, where it participated in the strategic bombing campaign against Germany, earning a Distinguished Unit Citation in an attack against Misburg. The group flew 187 combat missions. Following V-E Day, the group returned to the United States and was inactivated at McChord Field, Washington in September 1945.