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This subject is from the Black Mesa Incident era.This is a safe article.

"I'm sorry, Corporal. This is a restricted area!"

The Military Police, commonly abbreviated as MP, consists of members of the United States armed forces who guard the Hazardous Environment Combat Unit's training base, Santego. They are charged with guarding areas that need security clearance to enter, and taking and storing the weapons that a member of the HECU uses during his training exercises.

Each soldier is armed with a MP5 and appear to wear a Powered Combat Vest. Unlike regular soldiers, however, MPs bear red and white sashes and the letters "MP" on their metal hard helmets, as well as an armband with "MP" on it. If talked to, they will utter only two phrases: "I'm sorry, Corporal, this is a restricted area!" and "This is a restricted area, soldier!".

Behind the scenes

  • In Half-Life, the Black Mesa security guards were originally also members of the Military Police.[3] They were eventually cut from Half-Life.
    • There is an unused audio file in which a scientist mistakes Gordon Freeman as one and remarks them as the "The Administrator's" men. This suggests that the Military Police were to be originally under command of the aforementioned character who was later retconned as Wallace Breen.
    • In one scene, an MP unit kills a scientist who looks like a security guard but it may have been a guard that betrayed them and was killed later by the MP soldier.
  • The MP were also supposed to say ''Don't confuse your rank with my authority, Corporal'' when they are interacted with.


  • Similar to Drill Instructors, if the MP were provoked with weapons, the game will end.
  • As with most new content introduced in Opposing Force, they have not appeared beyond said game.


List of appearances