Contingency Response Forces assigned to the 821st Contingency Response Group out of Travis Air Force Base, Calif., secure the perimeter around the Geronimo Landing Zone during a mission in support of Green Flag Little Rock exercise, Feb. 11, 2019, Fort Polk, La. The primary objective of the exercise is to support the Joint Readiness Training Center and provide the maximum number of airlift crews, mission planners and ground support elements to a simulated combat environment with emphasis on joint force integration. (U.S. Air Force photo by Tech. Sgt. Liliana Moreno)