Unit/ Formation: Royal Marines Location: Antwerp/ Sheldt Period/ Conflict: World War II Year: 1944 Date/s: 2nd March 1944 5 RM AA Brigade: Units of MNBDO AA Brigade retained were formed in 5 RM AA Brigade on 22/3/1944. Equipped with the QF 3.7-inch AA was Britain's primary heavy anti-aircraft gun during World War II. It was roughly the equivalent of the German 88 mm FlaK and American 90 mm, but with a slightly larger calibre of 94 mm. Production began in 1937 and it was us