The Arg.3 is a Costigarian Self-Propelled Gun. Unlike the Type 50, it mounts a slightly smaller gun in favor of a more "mortar" approach. Both tanks still have limited armor , and aren't meant to directly compete with enemy tanks.
Mr. Small. It's a curious color scheme. That bright blue is a bit of an eye catcher. Hey, don't you worry about what anybody says about your stuff being "Good enough" or "Not good enough". You just keep building and posting. The real trick in these games is to never never never... ever... miss an opportunity to annex a free territory. Blue armor or not... an unoccupied territory never fights back right? Attack!