Secretary of Defense James N. Mattis cheers on the U.S. Army football team during a pep rally at the Pentagon on Dec. 8, 2017, in Washington. (Air Force Staff Sgt. Jette Carr/DoD)
A CH-53E Super Stallion helicopter picks up an AV-8B Harrier engine to during a Helicopter Support Team mission as part of Combined Composite Training Unit Exercise, Dec. 1, 2017, in the Atlantic Ocean. (Cpl. Jon Sosner/Marine Corps)
A Navy Super Hornet receives fuel from an Air Force KC-135 Stratotanker over Afghanistan, Dec. 7, 2017. Navy Super Hornets conducted a series of precision airstrikes against six Taliban narcotic targets in Helmand province. Air Force photo by Jeff Parkinson
Army Staff Sgt. Nikita Revilloza, a jumpmaster, relays commands during the 20th Annual Randy Oler Memorial Operation Toy Drop at Camp MacKall, N.C. The event allows soldiers to maintain their airborne readiness and give back to the community. (Spc. Darius Davis/Army)