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Half-Life: Opposing Force Hints
Alien Grunts (Xen Soldiers)
Alien grunts are the large, hornet-shooting aliens from Half-Life. They do not appear very much in OpForce, so deal with the three or so that you meet in any way you want. They fire heat-seeking hornets at you that chase you down. Grunts take quite a bit of firepower to put down, but compared to newer aliens such as the voltigore, they should be pretty easy. Always aim for the head of a grunt, though. Body armor helps protect them, although the body armor is not impervious to your weaponry.