A skin of the Overwatch Civil Protection, fighting to protect our glorious Combine! The undersuits are based off of Nemez's models.

"Civil Protection, also referred to as the Metro Police is the Combine's oppressive human police force in all Combine-controlled urban areas on Earth, including City 17. It's officers are named Metro Cops, while the spelling Metrocops is also used. Part of the Combine Overwatch, Civil Protection officers are ordinary human volunteers who have willingly joined the Combine, either for more privileges, such as additional and higher-quality food, better living conditions, an increase in authority and status over others, or out of genuine sympathy and identification with the Combine's aims." CombineOverwiki

First appearing in Valve's 2004 video game Half-Life 2 and later in the 2020 video game Half-Life: Alyx, they're the lower ranking human police force of the Combine.