Petty 3rd Class Kevin Luby looks through an illuminated sight glass. Navy Petty 3rd Class Kevin Luby looks through an illuminated sight glass to check for impurities in aviation fuel inside the JP-5 pump room aboard the aircraft carrier USS John C. Stennis (CVN 74) on Oct. 11, 2006. Luby is a Navy aviation boatswainís mate who specializes in aircraft fuel. SHARE: Download: Full Size (0.08 MB) Credit: VIRIN: 896272-C-ZED96-463.jpg Photo Gallery