U.S. Air Force Airmen of different bases, wings, and squadrons work together to build a small shelter system tent during the Silver Flag exercise on Ramstein Air Base, Germany, Aug. 1, 2009. There are about nine to ten Silver Flag exercises held throughout the year at the Construction Training Squadron, and the average class size is 100 to 200 people. (U.S. Air Force photo by Airman 1st Class Grovert Fuentes-Contreras)(Released)