This is not a new idea. The Boy Scouts of America was created to serve a similar function. Israel has been doing it for decades, with very positive results.
As a matter of fact, when my friend Josh, an american citizen and a hebrew, went to Israel with his mother and father, also American citizens, to visit family, he was immediately placed in bootcamp. He was only 14 years old, and it didn't seem to matter that their vacation was to last a mere two weeks. At the end of the two weeks, he was driven to the airport and given back to his parents for the flight home.
You should have read the postcard he sent me while at bootcamp; "DUDE, I am in BOOTCAMP! This fucking country is LAME! They kidnapped me before we even left the airport and told my parents if I refused to go we'd have to leave the country! I'm an American citizen, DAMNIT! HOW CAN THIS HAPPEN?"
The second postcard read like this; "Its actually kinda' cool having my own M-16. I don't want to leave. My parents are making me go, but I want to come back this summer and finish my training."
It makes sense. Especially when one considers who Israel's neighbors are. Invading the country is somewhat like invading a large millitary base, as both men and women go through basic training. It also insures that almost all citizens are literate and aware of their civic duties as Israelites once basic training has been completed. The list of benefits is endless. With this in mind, why would we argue against it?