Security Trooper

Description
The Security Trooper is a humanoid enemy encountered very early in the game, and is usually one of the first ones you'll encounter. They can also be encountered in an elite variety in later levels. They appear as masked men in riot gear, and are armed with weapons based on the color of their uniforms. Blue security troopers are armed with pistols, Pink security troopers are armed with assault rifles, and Orange troopers are armed with shotguns.

Behavior
Upon sighting the player, security troopers will immediately turn and begin firing at the player. If their line of sight is broken, they will continue to direct suppressing fire at the spot where visual contact was broken, after which they will attempt to pursue the player.

Tactics
Troopers make up the bulk of enemies you'll be facing early on, though in later levels they begin to progressively get replaced by robots. Troopers take critical damage when shot in the head, and a headshot from almost any weapon will kill a trooper in a single shot. Troopers are easy to predict and are susceptible to taking friendly fire from one another due to their tendency to lay down suppressing fire when losing sight of the player, which may lead to other troopers walking into their comrade's line of fire.

Elite troopers found in later levels are nearly identical to their standard counterparts, but can be differentiated by their silver armor and faster movement speed.