It only uses COD (not United Offensive) but it's a brilliant teamplay mod for the game, and if I had to think of one mod that gives me fond memories, it would be this one.
You can download it from here http://www.5punk.co.uk/downloads/Call%2 ... e_v1.0.exe
Let me know if any of you are interested, as I really think you guys would enjoy it. Think Domination in United Offensive, but a lot better, with some of the best custom maps ever made for the game.