I did this just over a year ago and can confirm many other ex-mil ATCO have done the same. It is an expensive business, approx 20k for just one license. It's hard work but is worth it IF you secure employment at the end. Here comes the caution...... there are not many vacancies out there. My place of work has a stack of CV's from eager new ATCOs ex-mil or otherwise. maybe things will pick up one day but most employers are pleading poverty and recruitment and training budgets seem to be minimal. Good luck though.