Keywords: US Navy 030220-N-9273C-027 A Pre-Aimed Calibration (PAC) test-fire is conducted on a Close in Weapons System (CIWS) to check the gun^rsquo,s bore alignment.jpg en At sea aboard USS Carl Vinson CVN 70 Feb 20 2003 -- A Pre-Aimed Calibration PAC test-fire is conducted on a Close in Weapons System CIWS to check the gun s bore alignment CIWS is primarily used for air defense against missile and aircraft threats Carl Vinson is currently conducting operations in the Pacific Ocean U S Navy photo by Photographer's Mate Airman Nicole Carter RELEASED 2003-02-20 030220-N-9273C-027 Navy http //www navy mil/view_image asp id 4653 U S Navy photo by Photographer's Mate Airman Nicole Carter PD-USGov-Military-Navy Aboard USS Carl Vinson CVN-70 Phalanx CIWS firing |