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The Combine Guard never went past the concept stage.
Sharing its name with the part-human, part-Synth unit, the Combine Guard[1] was apparently the first humanoid unit to have been suggested, and was probably an early higher ranked Civil Protection unit, like the Elite Metro Cop. Concept art from Half-Life 2: Raising the Bar shows a soldier with a long trench coat inspired in part by the German SS uniforms of World War II. The different helmet versions were the basis of the final Metro Cop and the Overwatch Soldier.[1]
Gallery
Trench coat version.
Version closer to the final version.
Several heads.
Propaganda poster including the trench coat version.
The same poster in a piece of concept art for the Breencast (right).
Propaganda poster including the trench coat version and alternate gas masks.
Propaganda poster including the Consul and alternate gas masks.
Ghostly Beta texture based on the early Barney model (using the previous texture) in the way of this G-Man image, originally used for the "e3_end" and "hazard01" ending sequences. This suggests Barney was probably a Combine Guard in the early stages of development.