PITTSBURGH INTERNATIONAL AIRPORT AIR RESERVE STATION, Pa. -- Lt. Col. Christopher Kurpiel assumed command of the 911th Operations Support Group as Lt. Col. Christian Constantine relinquished command and retired from the military during a dual ceremony at the Pittsburgh International Airport Air Reserve Station, Pennsylvania, July 11, 2020. Specific changes were made to the format of the ceremony to allow ceremony participants and attendees to adhere to Centers for Disease Control and Prevention guidelines regarding the spread of COVID-19.