Replacing thr guidance system of a standard SRM round with more explosives, the OGRE (Ordnance, Gyro-stabilized, Rocket Engine) delivers 50 percent more punch than the normal SRM, but loses one third of the effective range. At least the curved fins and spin blades in the exhaust make the missile rotate and provide gyroscopic stability, so it doesn't suffer from a lack of accuracy like the MRM. ^^