

Guess the Sulaco was available. The Nostromo was gigantic for seven crew. 300m long spread out over 3 decks. The refinery where the ore was was about 6 times larger than the towing vehicle.

I think i guess they felt for the size that was Hadleys Hope Colony, and what little they was expecting.... they may have felt that sending a full complement of Marines was a Overkill and not needed.
R.I.P Sox 01/01/2006 - 11/10/2017