It's nit terribly clear from the article what teacher training the ex-military people will have completed. If they have been through one of the established programmes of training, then they will be as equipped to be teachers as anyone else (assuming that teacher training is indeed rigorous). In this case, I do no see a problem, as military ethos schools such as DOYRMS have been running successfully for generations.
If they plan to use unqualified staff, then that wouldn't apply.