Lineage. Established as 11 Observation Group on 1 Oct 1933. Redesignated as 11 Bombardment Group (Medium) on 1 Jan 1938. Activated on 1 Feb 1940. Redesignated as: 11 Bombardment Group (Heavy) on 1 Dec 1940; 11 Bombardment Group, Heavy, on 3 Aug 1944; 11 Bombardment Group, Very Heavy, on 10 Jun