The U.S. sent in the big boys last weekend. The howitzer equipped AC-130 is essentially a C-130 Hercules transport plane that is converted into a tank. Here is a piece about how they have been overworked and are falling apart.
Here's a test of the A-10's Gatling gun. Holy schnikes!
I know. It's contradictory, even hypocritical, for a peacenik like me to be fascinated with combat aircraft.