Lineage. Established as 99 Bombardment Group (Heavy) on 28 Jan 1942. Activated on 1 Jun 1942. Redesignated as 99 Bombardment Group, Heavy, on 30 Sep 1944. Inactivated on 8 Nov 1945. Redesignated as 99 Bombardment Group, Very Heavy, on 13 May 1947. Activated in the Reserve on 29 May 1947.