U.S. Navy Aviation Ordnanceman Airman Eric Hornbeck uses a sound-powered telephone near a .50-caliber machine gun mount during an exercise aboard the Nimitz-class aircraft carrier USS John C. Stennis (CVN 74) while under way in the Pacific Ocean Aug. 2, 2011.
The John C. Stennis Carrier Strike Group was on a scheduled western Pacific Ocean and Arabian Gulf deployment. (DoD photo by Mass Communication Specialist 2nd Class Walter M. Wayman, U.S. Navy). Original public domain image from Flickr