Overwatch

Overwatch is the Earth branch of the Combine Empire's military in Half-Life 2.

All Combine soldiers wear gas-masks, radios, and vocoders.

Metrocops
Metrocops are members of the Civil Protection, the military police of Overwatch. They are unmodified humans pressured into brutally policing their fellow citizens in exchange for benefits like extra rations and sexual stimulation. They're equipped with light grey combat armor and their weapons consist of stun batons, USP pistols, and MP7 submachine guns.

Overwatch Soldiers
Overwatch Soldiers are the army of the Overwatch. They've had extensive surgery done on their bodies and brains to make them superhuman and obedient drones for the Combine. They have dark grey plated armor, MP7s, SPAS-12 shotguns, and Pulse Rifles.

Overwatch Elites
Overwatch Elites are the most elite of the Overwatch Soldiers. They have white plated armor and Pulse Rifles.