Cmdr. Scott Langum shakes his predecessor's hand, Cmdr. Eric Gleason, in a change of command ceremony, June 20, 2013, at Ellington Field in Houston. Langum will assume the duties of commanding officer of Coast Guard Air Station Houston, which is responsible for missions ranging from search and rescue to maritime environmental protection. (U.S. Coast Guard photo by Petty Officer 3rd Class Manda M. Emery)