Santa Claus high-fives a servicemember's child during his visit to the Air Reserve Personnel Center Dec. 19, 2014, on Buckley Air Force Base, Colo. (Rob Hazelett/U.S. Air Force)

A Reserve airman from the 512th Airlift Wing delivers humanitarian supplies to Nicaragua aboard a C-5M Supergalaxy on Dec. 20, 2014. Some 125,000 pounds of food and educational equipment were airlifted to Nicaragua's Augusto C. Sandino International Airport in Managua. (Steve Lewis/U.S. Air Force)

Air Force Falcons Shayne Davern breaks away from the Bronco?s defense during the first half of the Idaho Potato Bowl game against Western Michigan on Saturday, December 20, 2014, in Boise, Idaho. (Liz Copan/U.S. Air Force)

Islanders carry half of a bundle that dropped on their island during Operation Christmas Drop at Mogmog, Ulithi Atoll, on Dec. 9, 2014. Ongoing for 63 years, the drop delivers supplies including, food, clothing, medicine, tools and toys to the islanders. (Cody H. Ramirez/U.S. Air Force)

A U.S. Air Force KC-135 Stratotanker from the 909th Air Refueling Squadron refuels an F-15C Eagle near Okinawa, Japan, on Dec. 23, 2014. (Maeson L. Elleman/U.S. Air Force)

The first Royal Australian Air Force F-35A Lightning II jet arrived at Luke Air Force Base, Ariz., on Dec. 18, 2014. (Staci Miller/U.S. Air Force)