henmere over 7 years ago The mechs are 12式装甲歩行戦闘車 (Type 12 Armored Walking Combat/Fighting Vehicles), the most common model of HIGH-MACS (HIGH-Mobility Armored Combat System). http://en.wikipedia.org/wiki/Gungriffon
JPN.F.L. 501st MACS 外機501 is short for 日本外人部隊 第501機動対戦車中隊 (the Japan Foreign Legion 501st Mobile Anti-Tank Combat Squadron). For some reason, this fictional foreign legion is called "JPN.F.L.", not "JFL", in Gungriffon's history.