Full-track Prime Mover M35.
The M35 was a 3" GMC M10A1 that was converted to a prime mover by removing its turret and armament. Spare road wheels and other stowage was added, as well as tank recovery vehicle-style towing pintles at the front and rear. The front outlets for the air compressor are visible beyond the front towing pintle, and the hosing on the front upper hull is protected by a guard. Similar air outlets were routed to the rear. (Picture from Catalogue of Standard Ordnance Items, second edition 1944, volume I: Tank and Automotive.)
