Sgt. Maj. Efren Z. Whitehead (right), sergeant major of the Marine Corps Engineer School, Marine Corps Base Camp Lejeune, salutes the American flag delivered by the 310SUG-V counter-improvised explosive device robot during a retirement ceremony for Col. David S. Heesacker, commanding officer of MCES, at Courthouse Bay aboard the base, July 1. Heesacker is retiring from the Marine Corps after 32 years of active-duty service.