"On the topic of PTSD our soldiers are not "trained" to cope.". Not correct. All the training and conditioning is supposed to help them cope, deal with or any other words you want to use. The desensitization is part of that.
And this basically feeds into my argument. Soldiers play these games (as an example), they go off and are able to carry out their duties easier, then realise there are consequences, to them psychologically. Seemed easy when it was a game on a screen or running drills with simunition.
And SAS soldiers are certainly not immune to PTSD. Being able to switch you emotions off as you put it does not mean they are not affected by PTSD.