The Yahoo 6mm Science Fiction group has a nice little set of rules called “Prophecy of War,” about which the author writes:
These rules are intended to fill a gap in the science fiction wargaming rules market. We needed a set of rules that could cope with the sheer amount of models that we wanted to use, because, of those rules that we tried, none could match our demands. Often playing games with six players, and each wanting to use over fifty models, as well as infantry and air support, we found that our sessions were somewhat slow. Even worse was the amount of time calculating army lists. We wanted to be able to turn up and play (lazy as that sounds).
1.1 Design philosophy
These rules are not intended for any specific future, or universe. They are useable in any futuristic game intended to create large scale mayhem. We have assumed that the current military balance has remained intact, since most science fiction wargamers tend to enjoy using land vehicles (even if they are far out of scale in many cases). This means that infantry and tanks still have a place on the battle field. There are many rules sets that provide infantry rules, and we have always found them to be tedious when used in large numbers, so we wanted something really fast. The aim was to make infantry into a useful tool within the game, and not just a minimum requirement in an army list.