U.S. Marine Corps Lt. Col. Kirk Coker, the commanding officer of Security Cooperation Task Force (SCTF), Africa Partnership Station 2011 (APS-11), airs out after exiting a gas chamber at Marine Corps Base Camp Lejeune, N.C., Feb. 1, 2011. Marines with SCTF completed their annual gas chamber qualification and mask confidence exercise in preparation for an upcoming SCTF APS-11 deployment.