IDF Caterpillar D9 "Doobi" armored bulldozer. The IDF uses the armored version of Caterpillar D9 tracked-type tractor bulldozer for combat engineering and counter-terrorism operations. The Israeli armor kit proved itself very effective against terrorist weapons, a specially against large "belly charge" IEDs and roadside bombs. Military experts cite the IDF D9 as a key factor in keeping IDF casualties low in the ongoing war against Palestinian terrorism.