Image 0 of 5U.S. Navy sailors render honors aboard the aircraft carrier USS Nimitz (CVN 68) on Nov. 21, 2017, as the ship passes the USS Arizona Memorial at Joint Base Pearl Harbor-Hickam. (MC3 Cole Schroeder/Navy) A Marine with 1st Battalion, 3rd Marine Regiment, attached to 3rd Marine Division, descends from an MV-22B Osprey on Nov. 28, 2017, at Camp Hansen, Okinawa. (Lance Cpl. Andy Martinez/Marine Corps) Airman 1st Class Nicholas Castellucci, 724th Air Mobility Squadron member, flips a tire with his teammates during the first Combat Warrior Challenge at Aviano Air Base, March 14, 2017. The four-day competition included obstacles such as a wall climb, tire flip, and kettle bell carry. (USenior Airman Cory W. Bush/Air Force) Soldiers assigned to the 716th Explosive Ordnance Disposal Company conduct mass-casualty search-and-rescue training Nov. 21, 2017, at Joint Base Elmendorf-Richardson, Alaska. (Curt Beach/Pacific Command) Secretary of Defense James Mattis hosts an enhanced honor cordon for Libya’s Prime Minister Fayez Serraj Nov. 20, 2017, at the Pentagon in Washington. (Air Force Tech. Sgt. Brigitte N. Brantley/DoD)