Back when I was an Air Force officer, USAF doctrine on Congressmen was very firm. Treat them with courtesy and respect, get them any information they ask for right away, fly them anywhere they want to go, and furnish them with an official car and a driver. Be nice.
Why? Two reasons really. The Air Force is the armed force of a democracy, it is under the control of the civilian government, and Congressmen are that civilian government. Showing respect to a Congressmen is like showing respect to the flag. Plus, Congressmen write the Air Force budget, treat them properly and the service might get more funding next year.
Now we come the the TSA, who hassled Senator Rand Paul the other day. TSA apparently doesn't believe in showing respect to anyone, let alone Congressmen. And they are stupid enough to think they are immune to budgetary reprisals. That is an atrocious attitude for the security forces of a democracy.