>>7736182His helmet/Queen Head has a small warhead that launches from it to obliterate the queen and/or hive in one shot.
In the Rhino Alien comic he uses his eco suit to rescue two colonists that we’re going to be facehugged and kills the queen and her rhinos in the hive as soon as he gets the colonists away.
His ‘disguise’ is supposed to let him amble on into a hive without setting off any alarms by the xenos. Mind you, unless he’s packing pheromones like Jeri did his ruse would last for all of five seconds before his non-Xeno scent gives himself away.