All-Terrain Assault Platform

The All-Terrain Assault Platform, Model 2 (ATAP), colloquially known as the "Mad Dog," is an innovative all-terrain walker, specifically an exoskeleton, employed primarily by the UNSC Marine Corps and to a lesser extent by the Army.

Introduced as a field-ready prototype in 2569, the ATAP is, as its name implies, intended to be able to provide fire support for infantry without being bogged down by extremely rough terrain. It does so through the use of a relatively low weight and a pair of cutting edge robotic legs.

The final production model was shipped out as early as 2571, and the final vehicles of the line were retired and scrapped during the early parts of the Galactic War.