USS Lyndon B. Johnson (DDG-1002) is made ready before flooding of the dry dock at General Dynamic-Bath Iron Works shipyard, and subsequent launching of the third Zumwalt-class destroyer
7,800-ton Virginia-class submarine USS Delaware (SSN-791) being moved out of a construction facility into a floating dry dock using a transfer car system
KC-135 engine sits inside a new maintenance shelter at the headquarters of the Pennsylvania Air National Guard's 171st Air Refueling Wing near Pittsburgh, Dec. 12, 2018
F-35C Lightning II assigned to the «Argonauts» of Strike Fighter Squadron (VFA) 147 on the flight deck of Nimitz-class aircraft carrier USS Carl Vinson (CVN-70)
NORAD Chief of Staff Maj. Gen. Charles D. Luckey takes a call while volunteering at the NORAD Tracks Santa center at Peterson Air Force Base in Colorado Springs - AP