U.S. Sailors prepare to fire a .50-caliber machine gun during a night-time live-fire exercise on the fantail of the aircraft carrier USS Abraham Lincoln (CVN 72) in the Atlantic Ocean Oct. 25, 2017.
The Abraham Lincoln is underway conducting carrier qualifications and training. (U.S. Navy photo by Mass Communication Specialist Seaman Shane Bryan)www.dvidshub.net. Original public domain image from Flickr