1. A rocket for subcaliber training systems for an anti-tank weapon comprising a head, a rod extending rearwardly from said head, a number of propellant sticks arranged evenly spaced around said rod, means at the rear end of the head anchoring the front ends of said sticks to the head, a nozzle secured to the rear end of said rod, said nozzle comprising a cylindrical ring, a central hub in said ring joined therewith by a web, a plurality of circumferentially spaced bores extending through said web, said rings having a rearwardly elongated portion forming an elongated cylindrical space at the rear of said web and an igniter means mounted in said space, said igniter means comprising a plugshaped container, an ignition charge in said container, an end flange at the rear end of said plug-shaped container having greater diameter than that of said ring, a circumferential groove in said plug-shaped container adjacent said flange, a preferably thinned rim portion of said ring pinched into said groove, and a flexible tube connecting said ignition charge to a primer means adapted to be inserted into the firing pin house of a rocket launcher.