Army Tanks are machines used by the army.
Mr. Burns managed to commandeer a tank while running for Governor, and later when personally arriving at the Simpson residence with various members of the FBI to apprehend Mona Simpson for her part in a raid at a germ facility Burns had owned. The Air Force later attempted to use a Tank when apprehending Sideshow Bob, but the fact that the Air Force normally does not use Tanks also ended on a sour note when they also destroyed the Wright Brothers plane in the process. Bart later hijacked a Tank while under the influence of Focusyn with the intention of shooting down a MLB Satellite. Although not used by the Army itself, a tank did briefly appear in the end credits for "Homer Goes to College" during a football game, commandered by Benjamin, Doug and Gary.
The Army later brought along several tanks when Homer went AWOL.
Also, this tank is based on M1 Abrams MBT.