PITTSBURGH INTERNATIONAL AIRPORT AIR RESERVE STATION, Pa. -- Lt. Col. Gregory S. Sell assumed command of the 911th Aeromedical Staging Squadron during a ceremony at the Pittsburgh International Airport Air Reserve Station, Pennsylvania, Nov. 8, 2020. The ceremony, which included the traditional passing of the guidon and a pinning ceremony for Sell's new commander's insignia, is part of a centuries old military tradition that gave troops a visual representation of the transfer of command and an opportunity to get to know their new commander.