In Red Shift 2, you take control of the Black Enemy Army Sergeant Character as seen the Half-Life 0.52 alpha.
Best mod I've ever played. 10/10
Honestly I'm not sure what to even say about this mod. The main map just straight up does not do anything. You're given a turret and a room of boxes to shoot at, but nothing happens... You can't move outside of an invisible box and no enemies even appear to shoot at. Absolutely pointless.
The actual playable portion of the mod is the "Extra" option when starting a new game, in which you and three alpha barneys have to fight through waves of alien grunts to turn on the power and get inside a bunker. This part is OK, but it's not great. Your cover at the start of the map are two model trucks which the alien grunts can just shoot straight through. After that, you'd better get your grenade throws down to an art because you don't get any more ammo for your MP5.