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The subject matter of this article contains in-development information that was cut from the final version of an official and/or canonical source and appears in no other canonical source. It may also contain incomplete information since not all cut material is publicly known.

Missile defense model.jpg
Production information




Game information


The HK-707[1] is a static weapon cut from Half-Life 2. It can be found in the Half-Life 2 leak model files.


  • In early versions of Half-Life 2, the player was to maneuver missiles around certain areas. The HK-707 was to be a static autocannon designed to destroy these missiles with its two cannons.[2] Its model also has a gibs version, showing it was to be destroyable.[1]
  • Its design is somewhat similar to the Suppression Device located at the top of the Overwatch Nexus in Half-Life 2 and the texture under its top features shapes resembling the Citadel Core logo.
  • It also resembles the HECU-controlled mounted missile launchers seen in the Black Mesa Transit System in Half-Life.
  • It is unknown if it was to be automatic or operated by an NPC, although it features a handle on its back.
  • Its name is written several times on its body, while the model is simply named "Missile_Defense".
  • Its entity, "npc_missiledefense", can still be found in Hammer, but generates an error.


  1. 1.0 1.1 Playable Half-Life 2 leak files
  2. Half-Life 2 leak source code