VANDENBERG AIR FORCE BASE, Calif. -- Staff Sgt. Steven Zimmer, a 532nd Training Squadron air launch missile maintenance instructor, helps 532nd TRS students learn how to create a safety wire here May 4. Several items, such as bolts on a missile, must be safety-wired in place to prevent the parts from shaking loose during flight. Sergeant Zimmer has been an instructor for a year. (U.S. Air Force photo/Senior Airman Christian Thomas)