As per red dot's comment;
In manitoba, CT made most of the keystone games invite only. If you were a noob and if it was your first big milsim, you HAD TO attend a 12 hour training game before hand, which was basically just wolfpack marching you through the bush for 6 hours with sporadic contact and then a night game.
It was fantastic training for the newer people, and they made it through the 24hr game. Unfortunately the people who really needed the training never showed up and always quit like 2 hours into the night game -_-