Staff Sgt. Tray Knight drags a power cable from a Ground Mobile Forces Satellite Terminal to a power generator as members of the 225th Combat Communications Squadron set up for Exercise Roving Sands 97 at El Paso, Texas, on April 8, 1997. More than 20,000 service members from all branches of the armed forces of the U.S., Canada, Germany, and the Netherlands are participating in Exercise Roving Sands 97. The exercise is designed to refine their skills in operations using an integrated air defense network of ground, missile and radar early warning systems combined with tactical fighter and bomber aircraft operating in a simulated high-threat environment. The 225th, deployed from Martin Air National Guard Station, Gadsden, Ala., will provide communications links for Roving Sands 97.