Oh and Spt Wpns like Tarantulas = AT, Rapiers = Gen. Spt Wpn, T/Guns - HE (Hi-explosive) , Mortars - HE; ?would probably be at Bn Level like the Griffins. They would be in plts or a Hvy Weapons/Cbt Spt Co. ... just like in the SM1 IG TO&Es ! ?And in RL ! ?
?And Lion and Orange, came pretty close to being correct on their posts ... but the do have military backgrounds ... 
?And even if different Rgts from various planets would be put together (Task Organized) for a mission. Support functions would be similar. ?For example - in the ROK my US Mech Bn from 3rd Bde was attached to the 2d Inf Bde and Task Organized with a Tank Bn from 1st Arm Bde and a Korean Inf Bn ... ?it worked as the system is designed to be flexible ... And sometimes a USMC Co. would land in CH-53s and be attached to us. We'd throw'm on the back of the attached Tanks and move out !
ROK = Republic of Korea ! So you get a score of 99.9 % on L4 to civilian vernacular ! So very good job ! 
I've fired a few blanks myself ... it's a bad idea to kill your own guys in an exercise ... or for real for that matter ! No Blue on Blue engagements ! 
The SLR was more like our M-14 ... that was the first rifle I used as a cadet, besides the Springfield '03 for D&C and occasionaly the M-1. But eventually we got the M-16 which the SA-80 is comparable. But you know that !