Airmen from the Kentucky Air National Guard's 123rd Contingency Response Group and soldiers from the U.S. Army's active-duty 689th Rapid Port Opening Element from Fort Eustis, Va., erect a tent at MidAmerica St. Louis Airport in Mascoutah, Ill., on Aug. 5, 2013, as part of Exercise Gateway Relief, a U.S. Transportation Command-directed earthquake-response scenario. The two units are joining forces to stand up and operate a Joint Task Force-Port Opening, which combines an Air Force Aerial Port of Debarkation with an Army trucking and distribution unit. The aerial port ensures the smooth flow of cargo and relief supplies into affected areas by airlift, while the trucking unit facilitates their final distribution over land. (U.S. Air National Guard photo by Maj. Dale Greer/Released)