The Israeli Armored CAT D9—nicknamed Doobi (Hebrew: דובי, for teddy bear)—is a Caterpillar D9 armored bulldozer that was modified by the Israel Defense Forces, Israeli Military Industries and Israel Aerospace Industries to increase the survivability of the bulldozer in hostile environments and enable it to withstand heavy attacks, thus making it suitable for military combat engineering use.
The D9R, the latest generation of Caterpillar D9 bulldozers in IDF service, has a power of 405–410 horse power and drawbar pull of 71.6 metric tons (about 716 kN). Older generations, such as D9L and D9N are still in service, mainly in the reserve forces. The D9 has a crew of two: operator and commander. It is operated by the TZAMA (In Hebrew: צמ"ה = ציוד מכני הנדסי, mechanical engineering equipment) units of the Combat Engineering Corps.
The main IDF modification is the installation of an Israeli-made vehicle armor kit which provides armor protection to the mechanical systems and to the operator cabin. The operator and commander are protected inside an armored cabin ("the cockpit"), with bulletproof glasswindows to protect against bombs, machine guns, and sniper fire. The IDF also developed and installed slat armor add-on to deflect rocket-propelled grenade (RPG) rounds. The fitted armor package adds roughly 15 additional tons to the production-line weight of the D9. The modified D9 bulldozers can be fitted with disparate features, such as crew-operated machine guns, smoke projectors, or grenade launchers. The Israeli armor and durable construction of the D9 makes it impervious to landmines, IED and large belly charges.
The IDF uses the D9 for a wide variety of combat engineering tasks, such as earthworks, digging moats, mounting sand barriers, building fortifications, rescuing stuck, overturned or damaged armored fighting vehicles (along with the M88 Recovery Vehicle), clearing land mines, detonating IEDs and explosives, handling booby traps, clearing terrain obstacles and opening routes to armored fighting vehicles and infantry, as well as structures demolition, including under fire.