Mortar

From Command and Conquer Wiki

Mortars are an upgrade available to the GDI Pitbull. Although the Pitbull was designed to be an anti-air and recon vehicle, installing mortars will enhance the Pitbull's function, turning it into a light artillery platform. The mortars are capable of taking on vehicles and buildings. Infantry squads won't stand a chance, as the mortar rounds tear entire squads apart in mere seconds..

The mortars can be researched at the Tech Center.