Rid/Ian, I completely concur... (I think that's a doctor word... ;P) the times in civi EMS that I've seen the need for a TK have been, uhhhhh ZERO. Yes, we do teach TKs in Tactical Medicine, because if you elevate, you're probably in the line of fire now, it you need pressure, guess what, something's gotta apply that pressure, so either you do, and now you have no hands to remain in the fight, or someone else has to, which removes another person from the fight. TKs in a tactical environment are very simple, and effective, however I'm not so convinced that their use in civi EMS outweighs their potential misuse, with some apparently very few exceptions.
very good points