Aviation Ordnancemen load the M61-A1 20-mm gatling gun on an F-14D Tomcat assigned to Fighter Squadron Thirty One (VF-31). The M61-A1 Gatling gun is the main defensive weapon for U.S. Navy aircraft. Abraham Lincoln, VF-31, and Carrier Air Wing Fourteen (CVW-14) are on a regularly-scheduled six-month deployment conducting combat missions in support of Operation Enduring Freedom and Operation Southern Watch. U.S. Navy photo by Photographer's Mate 3rd Class Philip A. McDaniel.