Exercise - as in ORI (operational readiness inspection).
I was at Plattsburgh AFB when there was an ORI, when FB-111'a were based there.
KC-135 taking off sounds like the whole earth is shaking.
FB-111 taking off on burners sounds like the air is being torn asunder.
Got to lay in the boom pod and watch an F-111 do a "Zippo" after refueling. He took on enough fuel to fill his overflow or something like that (I am ignorant on that part - I program the computers not pass the gas LOL) then dumped it and hit afterburners -- lit up the entire sky. One of the coolest things I have ever seen.
The menu is on the right hand side of the page. Bird strikes are very costly.