This is an incredibly underrated game. You can play solo with an AI controlled team, or co-op with friends. This flew under my radar for a LONG time, but I recently bought it because it looks spectacular and people are saying great things about it.

Game Name: Six Days in Fallujah
Official Website: https://www.sixdays.com/
Game Engine: Unreal Engine 4 (Modified)
Game Genre: Tactical / Realistic Shooter
Anti-Cheat: Easy Anti-Cheat
Online Statistics: Not Sure
Video: https://www.youtube.com/watch?v=YTIptgR-2-Y