EW3 is correct. Although your son should expect to be mocked by gun guys around the globe for the abomination in the photo of the upper-right corner of this article: Attrition is down despite more challenging BMT - Air Force News, news from Iraq - Air Force Times
Here's a recent write-up in the AF Times. They tend to be sensationalist, but this seems to be a pretty straight-forward piece: Revamped boot camp reflects wars’ needs - Air Force News, news from Iraq - Air Force Times
You didn't mention how old your son is. One of my best friends went at age 25. He said the hardest part was watching all of his 18-19 year-old classmates resist everything they were told and getting everybody subjected to "special attention." He said that as long as you were smart enough to play the game and do as you were told, it was easy.
Disclaimer: I am not a grad (let alone recent) of AF basic training.
Hope this helps,