Hear,hear Epic.
I was just thinking something like this along similar lines myself this morning.I would have probably suggested the Navy myself,but I am sure the Army/RAAF is just as good.
And if at the end of your contract you still want to join QANTAS/Virgin/JHAS or whoever is on the scene then,well you will still have qualifications to give you a look in.
Also I would imagine that the wages/salary between the military and the airlines/MROs is about the same for the four years.
Something to consider.If I had my time over,I would strongly consider the military second time round.
Good luck.