Lineage. Constituted as USAF Regional Hospital, MacDill, on 18 Mar 1969. Activated on 1 Jul 1969. Redesignated as 56th Medical Group on 15 Mar 1987. Inactivated on 4 Jan 1994. Activated on 1 Apr 1994. Assignments. 15 Tactical Fighter Wing, 1 Jul 1969; 1 Tactical Fighter Wing, 1 Oct 1970; 56