Maj. Clark Burtch, U.S. Air Force, points out the operating area for his flight of F-15 Eagles during a pre-flight brief for a Exercise Roving Sands '97 mission on April 23, 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. Burtch is deployed for the exercise from the 2nd Fighter Squadron, Tyndall Air Force Base, Fla.