U.S. Marines with Combat Logistics Battalion 13, 1st Marine Logistics Group, walk into the gas chamber during Integrated Training Exercise (ITX) 2-15 at Camp Wilson on Twentynine Palms, Calif., Jan. 30, 2015. ITX 2-15, executed by Special Purpose Marine Air Ground Task Force 4, is conducted to enhance the integration and warfighting capability of all elements of the Marine Air Ground Task Force. (U.S. Marine Corps photo by Lance Cpl. Kathryn Howard, 1st Marine Logistics Group Combat Camera/Released)