Half-Life 2/Allies and enemies

The first enemies that you'll have to fight are the combine.

Combine police (Metro Cops) are the easiest. They usually have 9mm pistols and electric bats.They can be identified by white face masks.

Combine soldiers are more relative to cannon fodder. They have dark blue face masks.They'll usually have SMGs and sometimes pulse rifles. Their other jobs are sniping and using turrets.

Close-quarters combine are identified by thier orange eyes. They have shotguns.

Combine Elite have white suits with a single red eye. They usually use the pulse rifle's alt-fire. They've been known to restore combine generators with the PR's alt-fire.