African partner nation participants stand in formation during the opening ceremony for Central Accord 2013, at Douala Air Force Base, Douala, Cameroon, Feb. 20, 2013. Central Accord 13 is a joint exercise in which U.S., Cameroon and neighboring Central African militaries partner to promote regional cooperation while and increasing aerial resupply and medical readiness capacity. (Photo by Master Sgt. Stan Parker, 621st CRW Public Affairs)