I've always marveled at the fact that the US Air Force put hugeartillery cannons inside airplanes. Watching them in action is impressive.

Imagine all the energy that has to be absorbed so the airplane doesn't flip around at every shot. A wonder of military engineering.

Video by Airman 1st Class Stephen Ellis Hurlburt Field Footage of 1A9X1, Special Missions Aviation Airmen during preflight, ammo upload, and live fire training mission aboard an AC-130U over Hurlburt Field and the Eglin Air Force Base range.