JOINT BASE ANDREWS, Maryland - The U.S. Air Force at Joint Base Andrews (JBA), U.S. Army Corps of Engineers, Maryland Department of the Environment (MDE), GreenTrust Alliance and GreenVest LLC announced the completion of the first Umbrella Mitigation Banking Instrument (UMBI) for the Department of Defense in Maryland during an event held at The Courses at Andrews, Sept. 6, 2018.