If the teachers behind this have mainly seen, "It's great, you get to see the world, do (whatever the trade is), great times, great mates" etc, and AVOID talking about the less savoury bottom line issues (getting killed, wounded, fighting even if you don't agree with the cause), I can see why they think that way.
On the other hand, a management person wouldn't include in their sell, "You might die early through stress", would they. I don't think there's any harm in raising AWARENESS in schools that the armed forces have some good jobs to be had. But the recruiters should give at least some idea that it's not just a great job without mentioning the danger factor.
As we've been at war for 5 years, seems at the moment that the public know all about the hazards anyway. So I think it's a bad decision. One up for the veggie quiche brigade.