AF Basic Training is now 8 & 1/2 weeks, while your son will start at about $1340 a month, after 4 months (on active duty) the pay goes to about $1450 a month. Here's a link that might help.
http://www.dfas.mil/militarypay/mili...PayTable34.pdf
It's an honorable profession, and I congratulate you for raising a child who shows concern for his country. And by the way, he might even wrangle a pilot or navigator slot out of his unit, if he's a good worker and gets along with the guys and gals in his unit.
JJ