@gilsham: Marauder is the "nick name" for that kind of infantry unit. If you want to make it an object page I think you'd have to make it for the marauder's suit, not the actual unit. Much like a Space Marine or a Healer class.
"Recently i had 12 or so roaches get into my base and i wasn't sure how, i don't think they wormholed, but they did pop up from a burrow, is there anyway to prevent this? Would a sensor array help? Also are bunkers the only form of ground defensive structures terran have? "
There's a upgrade that enables roaches to move while burrowed. Either wall up your entrance or get some detectors, scanning with your orbital command also works.