The 117th Engineering Platoon is responsible for combat engineering missions. They are responsible for clearing sites for the 117th encampments, assembling the pre-fabricated building and tents, and digging trenches and fortifications to protect the unit. In addition to camp duties, the unit can be called to front lines to demolish structures such as bridges, buildings, or enemy bunkers once they have been cleared by forward units. They also get the unfortunate duty of mine clearance.
The Engineering Platoon is composed of 4 special weapons squads armed with meltas, flamers, or demolition charges. They utilize a unique vehicle from the motor pool, a Chimera excavator. The excavator is used to dig trenches, demolish buildings, build fortifications, and can even clear mines.
Of special note: I don't have a command unit for the Engineering Platoon. I'll put that on my list of things to do.
Modeling note: I ripped the tracks from a toy trackhoe and plopped them on top of a Chimera. I had to glue a strip of plasticard over the lasgun ports.