U.S. Navy Petty Officer 3rd Class Chadwick Arndt greases a catapult track in preparation for the launching of aircraft aboard USS John C. Stennis in the Pacific Ocean, March 30, 2015. Arndt is an aviation boatswain's mate equipment. U.S. Navy Petty Officer 3rd Class Chadwick Arndt greases a catapult track in preparation for the launching of aircraft aboard USS John C. Stennis in the Pacific Ocean, March 30, 2015. Arndt is an aviation boatswain's mate equipment. SHARE: Download: Full Size (2.6 MB) Tags: Photo Essays Credit: VIRIN: 050259-G-HOB79-266.jpg Photo Gallery