From Halopedia, the Halo wiki
Trying to but I still have not quiet figured out how to do it yet.
I wasn't randomly adding and the conjecture delete was by mistake. My source was references from Halo: The essentails series 1 and from halo the fall of reach when they talked about the 390 that may have been a caliber though.
I was the last one to edit the UNSC Army page prior to you why did you change it?