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Hey, catch me later, I'll buy you a beer.
- Barney
My mom is going to worry when I don't make it home tonight!
- Otis

Security Guards are Black Mesa staff that are assigned with controlling secure access locations throughout the Black Mesa facility. They have basic combat training to ensure the safety of coworkers and are armed with handguns, and will assist players in combat.


Security guards can allow access to secured locations to players to obtain valuables such as health, armor and ammunition.

Unlike the soldiers, they only carry their M9 pistol and the Desert Eagle as their standard sidearms. They are not protected against environmental threats but are suited with Kevlar vests with helmets as standard issue.


  • Enemy security guards have a brown color scheme to their apparel and have paler skin, and they are referred to as Barnabus and Otto.
Black Mesa Scientist · Security Guard
HECU Grunt · Engineer · Medic · Sergeant
Black Ops Female Assassin · Male Assassin · Bodyguard
Aliens Alien Controller · Alien Grunt · Alien Slave ·

Baby Gargantua · Baby Headcrab · Baby Voltigore · Barnacle · Bullsquid · Chumtoad · Gargantua · Gene Worm · Gonarch · Gonome · Headcrab · Houndeye · Ichthyosaur · Kingpin · Leech · Nihilanth · Panthereye · Pit Drone · Pit Worm · Shock Roach · Shock Trooper · Snark · Stukabat · Tentacle · Voltigore · Xen Commander · Zombie

Machines Large Mounted Turret · Small Mounted Turret · Sentry Turret · Robot Grunt