Since you're saying school what do you mean? Is this basic training or a high school or what? Judging by your location I'm guessing it's not the Academy since that's in Colorado unless I'm mistaken.
You're very specific that it's the Air Force you could do anything associated with it, make sure you know what the uniforms look like for those you're making the cake for if you're doing anything with one. You could also do something on a patriotic theme, you have to assume that someone willing to join the military is patriotic.
If it's a high school you could still do patriotic or Air Force but check what the cadet uniforms are.
I would definelty check out the uniforms.. they usually have a patch or a "mascot or theme" of somesort to it try to find out what that is that should give you some ideas. You could always do a sheetcake with the "patch" or symbol in the middle with some sort of red white and blue decorations around the outer border.. or you could do rounds in the same fashion..
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