US Air Force SENIOR AIRMAN Raymond Diaz-Rios, Crew CHIEF, 22nd Expeditionary Fighter Squadron (EFS), Spangdahlem Air Base, Germany, inspects the engine of an F-16 Fighting Falcon aircraft as part of his post-flight procedures at Prince Sultan Air Base, Saudi Arabia. The 22nd EFS is part of the coalition force here to support Operation SOUTHERN WATCH, a military effort to enforce the no-fly and no-drive zone in Southern Iraq