TRIANGLE SIGNAL U.S. Navy Petty Officer 2nd Class Nicholas Ferris signals to an AH-64 Apache helicopter during deck landing qualifications aboard the amphibious dock landing ship USS Fort McHenry in the Arabian Gulf, Feb. 24, 2015. Ferris is a boatswain's mate. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 520100-R-DMQ18-788.jpg Photo Gallery