Sailors listen to a safety brief on board the USS Nimitz.
Silhouette of a navy officer
Navy and Marine officer
Aerial oblique view of a U.S. Navy Seahawk helicopter and a fast patrol boat
USAF C-130J with invasion stripes
Air Serbia Airbus A319 Crew members captain Davor Miseljic and copilot Biljana Savic prepares for flight at Zagreb airport on December 12, 2014 in Zagreb
 Senior Chief Engineman Jason Saffa mentors Engineman Second Class Quanesha Jenkins on board the USS Rushmore (LSD-47) while deployed.