Petty Officer 3rd Class Carolina Franco removes corrosion from the barrel of an M61-A1 20 mm machine gun. U.S. Navy Petty Officer 3rd Class Carolina Franco removes corrosion from the barrel of an M61-A1 20 mm machine gun aboard the USS Dwight D. Eisenhower (CVN 69) in the Red Sea on March 19, 2009. The Eisenhower Carrier Strike Group is under way for a deployment in support of the ongoing rotation of forward-deployed vessels. SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 933343-B-GRI84-319.jpg Photo Gallery