Airman 1st Class Tupou Ainuu, 168th Security Forces Squadron fire team member from Eielson Air Force Base, Alaska, secures the flank with an M249 light machine gun during an urban warfare scenario as part of the basic security operations course at Andersen South, Guam, May 17, 2013. The Pacific Regional Training Center trains frontline defenders from all bases assigned to Pacific Air Forces on U.S. Central Command and regional training requirements so they can deploy as well as utilize trained skills at their home stations. (U.S. Air Force photo by Staff Sgt. Benjamin Wiseman/Released)