GoblinGranny makes a very valid point about the social aspects- and that is a point that may be difficult to grasp for politicians brought up in selective education.
State school teachers have to deal with absolutely everyone:
the autistic child who has meltdowns
the child with Downs syndrome who cannot understand the curriculum but still has to have an education that is meaningful to him
the blind child
the deaf child
the child with cerebral palsy who has to use a wheelchair and cannot hold a pen
the selective mute
the child who has frequent absences for cancer treatment but still needs to be slotted back into the class whenever he is not being treated
the child with extreme behavioural difficulties
the child who is so badly traumatised by family events that he would be signed off from the army with PTSD- but you cannot sign someone off from education: even if they are dying or completely unreachable they still have to be in education. The child with PTSD will still be in your classroom and you have to keep the other 29 children safe from him at the same time as providing an education that is meaningful to all 30.
Even in the rare cases where they do exclude a child, all that means is that the child has to be taught by some other teacher instead. There is no option of not educating a child, somebody has to do it.
I find it telling that when the poster who claimed army educators are used to dealing with all types was asked to contemplate SN, the example of SN s/he could come up with as an example of being used to all types was dyslexia! Teachers have to deal with considerably more than that.
Of course there is absolutely no reason why a compassionate and intelligent individual with an army background should not be able to learn how to handle these difficulties as well as any other compassionate and intelligent person with a different background.
But it is difficult to see how a background of effectively enforcing discipline will help with any of the above. And the whole idea of fast-tracking ex-army rather than any other profession seems to be based on the idea that an ex-army background will leave you better prepared for what you find in the classroom.