Absolute B@llocks.
With a graduate you get:
Shallower learning curve
Not enough ability to take discipline
Career compression
Probably serious girlfriend therefore unwillingness to deploy
Useless knowledge about Geography, Law, Fashion, basket weaving etc
Greater expectation of wage etc therefore more disappointment
"Maturity", if by that you mean set in their ways.
The fact that everybody gets a degree DEVALUES them, not the other way round.
Get em young when they learn fast, enjoy mess life and more importantly LOVE going away around the world.
Its a young mans game, so if anything turn Dartmouth, Cranwell, Sandhurst into 6th form colleges and go from there.
(and don't get me started on this Officer first rubbish
)