They are also allowed to carry a pistol according to the rules. While this makes sense, does that also mean they can only carry a pistol when the Sulaco has been boarded by aliens? They're still marines, albeit in a support role, so they would know how to use most of the basic marine weapons from presumably going through basic training/boot camp/etc.At most, one Maintenance Tech is allowed on the planet at a time to assist the FOB once it is secured and constructed, but is only allowed a pistol and no other weapons.
We talk about MTs, the most confused and misunderstood role on the Sulaco.