Seaman Danielle Hopper paints a rat guard for mooring lines aboard the USS George Washington. Seaman Danielle Hopper paints a rat guard for mooring lines aboard the USS George Washington (CVN 73) on Oct. 19, 2004. The Norfolk, Va.-based Nimitz-class aircraft carrier is conducting strike group sustainment training off of the east coast of the United States. Rat guards are placed over the mooring lines of the ship when it is pier side to prevent vermin from coming aboard. SHARE: Download: Full Size (0.03 MB) Credit: VIRIN: 149086-A-CTW18-470.jpg Photo Gallery