These are the rules and allowances for HM Forces if boarding in the UK:
Boarding School Allowance
Purpose
BSA is provided to enable the children of Service Personnel to have continuity of education that would otherwise be denied in the State sector because of the need to accompany the Service parent on postings at home and abroad
Eligibility
Parents ? Basic eligibility is that Service personnel must be serving married accompanied, and not within 12 months of discharge or, in the case of separated, divorced or widowed personnel, have care and control of the children.
Children ? Basic eligibility is that the child must be between the ages of 8 and 18 and undergoing full time education at a Boarding School included on the MOD?s Accredited Schools Database.
Remarks
Taxable in UK, but tax paid by MOD.
Rate
Junior - £4,338 per term
Senior - £5,621 per term
Subject to a minimum parental contribution of 10% of the total fees.
So for secondary boarding you get £16,863 and have to top that up by 10% at least.
In some parts of Europ, in Germany for example, there are Forces schools, so that the kids who go with their parents can be educated there, and I presume it is the same if you take your kids to the US or Canada, if you are lucky enough to be posted there.
We don't get all our rent paid, we pay Married Quarters rent for the substitute service family accommodation we have, as there are no married quarters where we are. We get a cost of living allowance as it more expensive in Europe than in UK for car tax, insurance, food, clothing, books etc than it is in the UK.
If the children are boarding in the UK, then they get a journey home paid 3 times a year. parents pay for exeat and half term travel.