Armored Robot Hunters

Armored Robot Hunters, or RUNTs, are the assault vehicle of choice of the United States government, and possibly of the government organization Triple-I specifically. They have four legs, two cannons, and a whole lotta robot ass-kickin' to do.

Classics
A squad of RUNTs cornered Megatron in an American forest. They were aided by the dimension-hopping Autobot Skyfall briefly before the arrival of Optimus Prime and a team of Autobots.