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surely being taught the skills to get a job on the outside is one of them and lets face it being taught to fly is probably the most expensive there is
Which is why there is a return of service commitment - which used to be X years on award of wings, but may have changed. Very few get to leave before they have given Betty some use of the skills she's paid for, and the ones that do are the unfortunates who have been medically downgraded.
AA
Absolutely right. For pilot it is currently 6 years from completion of first OCU - the longest Return of Service in the military IIRC. Prior to completion of OCU it is 3 years. Every course in the RAF (military?) has a return of service, once you have done that you are deemed to have repaid the investment.
DB
probably the most expensive there is
and that is why it attracts the longest ROS.