Perhaps more technically Stealth then Tactical Realism, the Death To Spies games had more realistic, open world 'sandbox' and emergent game play than anything else in the stealth genre -- then (2007) or since in my opinion, and bore more resemblance to Hidden & Dangerous 2 for aesthetics, atmosphere, depth of interactive features, realism, and difficult game-play.
Death To Spies 3 is making a second attempt at crowd funding here on KickStarter, and there's a good RPS article here that gives a synopsis of some of the history and direction taken. Although I can't speak to this latest i