Standing by their M1043 High-Mobility Multipurpose Wheeled Vehicle (HMMWV), Technical Sergeant (TSGT) Curtis Rayl, (left), USAF, and Senior Airman (SRA) Jerry Achan, USAF, 12th Security Forces Squadron (SFS), take part in increased measures, providing security for the base perimeter at Randolph AFB, Texas. Armed with a 5.56 mm M16A1 rifle a 12th Security Forces Squadron (SFS) member conducts a 100 percent ID check at Randolph AFB, Texas, as part of heightened security measures. Heighten security at Randolph AFB began shortly after terrorists hijacked commercial jetliners and crashing them into the twin towers of the World Trade Center in New York City and the Pentagon on September 11, 2001