Cpl. Adam Dublinske with the 11th Marine Expeditionary Unit executes a low forward knife thrust during martial arts training at Camp Pendleton, Calif., Oct. 2, 2018. (Gunnery Sgt. Robert B. Brown Jr./Marine Corps)Army Sgt. Ryan Duginski, M1 Abrams Tank Master Gunner, assigned to Task Force Raider, performed a remote-fire procedure, to ensure the tank’s proper functions at Bemowo Piskie Training Area, Poland, Nov. 6, 2018. (Sgt. Arturo Guzman/Tennessee Army National Guard)Sailors heave mooring line aboard the Arleigh Burke-class guided-missile destroyer USS Carney (DDG 64) on Nov. 5, 2018, as the ship arrives in Souda Bay, Greece, for a scheduled port visit. (MC1 Ryan U. Kledzik/Navy)Airman 1st Class Ian Alan Perez, 334th Training Squadron freestyle drill master, performs during the 81st Training Group drill down on the Levitow Training Support Facility drill pad at Keesler Air Force Base, Miss., Nov. 2, 2018. Airmen from the 81st TRG competed in a quarterly open ranks inspection, regulation drill routine and freestyle drill routine. (Kemberly Groue/Air Force)Soldiers assigned to the U.S. Army Drill Team, 4th Battalion, 3d U.S. Infantry Regiment (The Old Guard) perform after the conclusion of the 4th Annual Philadelphia Veterans Day Parade on Nov. 4, 2018. (Army)FORT BENNING, Ga. (Oct. 26, 2018) -- Two soldiers with the Airborne and Ranger Training Brigade demonstrate hand-to-hand combat maneuvers during the Rangers In Action demonstration preceding a Ranger Course graduation on Oct. 26, 2018, at Fort Benning, Ga. (Patrick A. Albright/Army)Marines assigned to 2d Low Altitude Air Defense Battalion team "One Mass" perform squad push-ups on Oct. 26, 2018, during the All Terrain Unit Competition on Marine Corps Air Station Cherry Point, N.C. The All Terrain Unit Competition is an annual event hosted by Cherry Point Marine Corps Community Services for Marines and sailors on station to build camaraderie through friendly competition. (Cpl. Micha R. Pierce/Marine Corps)Navy divers prepare to attach the "front porch" to a test version of the Orion capsule as part of Underway Recovery Test-7 in the open water of the Pacific Ocean on Nov. 1, 2018. Nearby is the USS John P. Murtha. (Tony Gray/NASA)Mr. and Mrs. Claus, traveling with Operation Santa Claus, disembark an HC-130J Combat King II aircraft from the Alaska Air National Guard after landing in Emmonak, Alaska, on Nov. 1, 2018. Operation Santa Claus is an Alaska National Guard annual community outreach program that provides Christmas gifts, books, backpacks filled with school supplies, fresh fruit, and sundaes to youngsters in rural communities. (Spc. Michael Risinger/Army National Guard)A U.S. Air Force F-15E Strike Eagle with the 48th Fighter Wing from RAF Lakenheath, England, flies behind a U.S. Air Force KC-135 Stratotanker with the 100th Air Refueling Wing from RAF Mildenhall, England, during a deployment to Amari Air Base, Estonia Nov. 1, 2018. (Senior Airman Kelly O’Connor/Air Force)