Capt. Valentin Boza, commander of 4th ESC Headquarters and Headquarters Company, salutes during the playing of the national anthem. The 4th Sustainment Command (Expeditionary) held a change of command ceremony May 3 at the MacArthur Parade Field located at JBSA Fort Sam Houston. The ceremony recognized Brig. Gen. Norman B. Green, outgoing commander, and Brig. Gen. Kenneth D. Jones, incoming commander.