Col. William L. Zana takes command of the Bowling Green-based 91st Troop Command from Col. Lapthe C. Flora May 21, 2016, in a traditional change of command ceremony at Fort Pickett, Virginia. Brig. Gen. Walter L. Mercer, the Virginia National Guard's Assistant Adjutant General - Army, presided over the exchange of unit colors that represented the transfer of command from Flora to Zana. (Photo by Cotton Puryear, Virginia National Guard Public Affairs)