PACIFIC OCEAN - The Mk-45 5-inch .54-caliber gun is fired from the forecastle during a pre-action calibration live-fire exercise aboard the Ticonderoga-class guided-missile cruiser USS Cowpens (CG 63). Cowpens is forward deployed to Yokosuka, Japan, and is underway in the U.S. 7th Fleet area of responsibility. (U.S. Navy photo by Mass Communication Specialist 1st Class N. Ross Taylor/Released)