PACIFIC OCEAN -- Coast Guard Cutter BERTHOLF's 57mm gun fires at an unmanned aerial vehicle drone Feb. 26, 2009. BERTHOLF's crew is conducting Combat System Ship Qualification Trials this week to test its ability to engage surface and aerial targets. Bertholf's crew successfully shot down aerial and surface drones with both the 57mm gun and the Close In Weapon System (CIWS). (U.S. Coast Guard photo/PA3 Henry G. Dunphy). 090226-G-0694D-047