A Marine with Combined Joint Task Force (CJTF) prepares to take a drink from his canteen in Mission-Oriented Protective Posture response level 4 (MOPP-4) Gear during a training exercise Camp Doha, Kuwait during OPERATION ENDURING FREEDOM. The Marine is dressed in his Joint Service Lightweight Integrated Suit Technology (JSLIST), wearing an M40 Chemical-Biological Field Mask with a C2A1 filter canister