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Half-Life: Opposing Force Hints
Military Turrets
These are automated target-seeking machines that the military has set around for automated defense. They can't walk around, but they can swivel 360 degrees. They start out dormant, but activate and scan for targets when you (or someone else) walk through their red laser alarm beam, brush up against them, or start damaging them.
The best way to take one of these things out is to shoot it in the leg or in the top of its "head" while keeping something solid between you and it so that it can't shoot you. Bouncing a grenade around a corner also works well.
