 At Fort DuPont, the First Engineers along with these civilian workers, constructed four identical sets of brick duplexes and a 398-seat movie theatre, all of which still stand today.Prior to the start of World War II, the 1st Engineer Regiment was reorganized as the "1st Engineer Combat Battalion" and again assigned to fight as part of the 1st Infantry Division.In October 1939, the 1st Engineer Regiment was reorganized, separating into two battalions.