PITTSBURGH INTERNATIONAL AIRPORT AIR RESERVE STATION, Pa. -- Raymond Gonzalez signs his enlistment paperwork after taking the Oath of Enlistment with Master Sgt. Christopher Beck, recruiter with the 911th Airlift Wing at the Pittsburgh International Airport Air Reserve Station, Pennsylvania, Jan. 31, 2020. The Oath of Enlistment is a time-honored tradition that marks the moment someone becomes a member the U.S. military.