Be prepared for a lot of training. And more training... You could be guarding nukes, planes, responding to intrusions, deploying around the world. You will play a lot of war games. In fact at times you will be sick of them. But trust me it is for good reason. I was in munitions but knew many security people. The Air force really is what you make of it. Congrats on joining. Do you have a first duty station yet? I spent 20 years in the Air Force and would be happy to try and answer any Q's you have.