Lineage. Constituted 20 Dental Squadron on 26 Aug 1994. Activated on 1 Sep 1994. Inactivated on 1 Aug 1997. Activated on 15 Aug 2007. Assignments. 20 Medical Group, 1 Sep 1994-1 Aug 1997. 20 Medical Group, 15 Aug 2007-. Stations. Shaw AFB, SC, 1 Sep 1994-1 Aug 1997. Shaw AFB, SC, 15 Aug