Academy has reissued their M4A3 Sherman kit, originally released with the M1 Dozer Blade (look here). This time they've replaced the dozer blade with the T34 Calliope rocket system. With the success of the Katyusha rocket artillery systems in the Soviet Army and Germany's response with the Nebelwerfer, US forces adopted the T34 multiple rocket launcher system which was designed for mounting atop modified M4 Sherman tanks. Each system carried around 60 4.5 inch rockets which could be fired in groups or in one volley. Elevation of the rocket tubes was controled by the elevation of the main gun.