Staff Sgt. Hank Moon, 9th Air Refueling Squadron boom operator, and his brother Staff Sgt. Aaron Moon, 9th Air Refueling Squadron engine specialist, walk down a trail at Travis Air Force Base, California, on Jan. 31, 2017. The Moon brothers have been stationed together at Travis since 2011. (U.S. Air Force photo/Staff Sgt. Daniel Phelps)