Manufacturer Combine Usage Used by Overwatch forces Rebels Gordon Freeman Alyx Vance Barney Calhoun   Many of the weapons manufactured by the Combine rely on pulse technology, itself relying on Dark Energy resources. Contents 1 Overview 1.1 Stationary weapons 1.1.1 Unmanned 1.1.2 Manned 1.2 Handheld 1.3 Within units 2 List of