The only reality show I saw that I liked was a few years back, and it didn't last. I forget the name and the channel, but it consisted of teams made up of soldiers, cops and firemen competing against each other in hostage-rescue and infiltration scenarios. Like the others they had to get rid of a member every episode, but it was fun because they had to extract 'hostages' from convoys and buildings, with helicopters and 'enemy soldiers', with everybody firing laser rifles, and it could end up going any way imaginable.
[edit] Found it! It was called
Combat Missions.
http://en.wikipedia.org/wiki/Combat_Missions