The Defense Language Institute English Language Center manages the Department of Defense English Language Program (DELP). Designated the 637th Training Group in 2015, DLIELC is under the command of a dual-hatted US Air Force colonel Commandant; the Deputy Commandant is an Army lieutenant colonel; and the operations squadron commander/commandant of troops is an Air Force lieutenant colonel. Other military members consist of Army, Air Force and Navy personnel. The over 300 civilian members of the staff include the instructors who are qualified in the area of English as a second language.