Raytheon, IMI to Provide Guided Bombs for Marine Corps Mortars Defense TechnologyModernization & UpgradingLand SystemsFire SupportDec 10, 2015 23 PERM gives a combat commander the ability to destroy enemy targets at longer ranges using fewer rounds. Raytheon-IMI Precision Extended Range Mortar bomb.… Raytheon, IMI to Provide Guided Bombs for Marine Corps Mortars | Defense Update: Precision Extended Range Munition (PERM) is a U.S. Marine Corps program that gives a combat commander the ability to destroy enemy targets at longer ranges using fewer rounds. A typical mortar round travels about seven to eight kilometers. The PERM rounds can reach distances up to 16 kilometers. The basic version selected by the USMC is GPS guided. In the future Raytheon plans to add semi-active laser guidance to its PERM rounds, enabling mortar teams to hit moving targets designated by forward or airborne target acquisition teams. The new GPS guided munitions will enable the USMC’s M327 rifled 120mm mortar units called ‘Expeditionary Fire Support Systems’ (EFSS) to double the range they can engage targets, and enable those units to hit their intended targets with maximum accuracy and efficiency. EFSS consists of two Internally Transportable-Light Strike Vehicles carrying a mortar tube and ammunition supply that can be moved as a single package in the belly of an MV-22B Osprey or slung under a CH-53E Super Stallion.