214/8 and 215/8

Hi - 214/8 and 215/8 seem to have been allocated to the U.S. DoD in ca. 1998. There does seem to be a few sizeable announcements (which overlap a few not-so-sizable ones), but I have to wonder if anyone can explain the grounds on which they were allocated these two /8s, and which body did the allocation. Anyone? Sean.