Science-Fiction Adventure in the Far Future
MIB - Title of a popular 10th Century (Imperial) holo-vid which portrayed a group of Imperial Marines ("Marines In Battledress") as the heroes of the 2nd Frontier War.
Since the release of the film c.940. The initials MIB have become widespread as referring to the Imperial Marines, especially the landing troops or expeditionary forces (in Battledress).
Ref: IMTU (sevarian)