Bonds aren't new. The defence forces have had bonds for years.
The RAAF charge 10 years and the Army 6 for their conversions courses. The pay post Grad is about half what a QF S/O gets, by the time they are able to get out they are paid about $85K per year depending on rank.
So $30K for a job you have aspired to, and lets face it is nil outlay unless you leave.
P.S I don't work for QF, I just turn someone else's money into my own.