This sounds a lot like UFO: Aftermath (a great game that I heartily recommend). If you can pull it off I shall be extremely impresssed, and play the hell out of it. Aftermath managed to capture the feeling of dread even better than XCOM did. You were, afterall, practically the only survivors on Earth after an alien victory. The only supplies you had were the ones you salvaged and manufactured yourself, and your replacement recruits were limited.
Is it possible to script getting recruits in-mission?
Hell, this makes me want to start a Xenonauts: Aftermath mod myself.