with a W84 nuclear warhead; withdrawn from service in 1991 to comply with the INF Treaty. AGM-109H/L Medium Range Air-to-Surface Missile (MRASM) – a shorter-range, turbojet powered air-launched cruise missile with cluster munitions; never entered service, cost 569,000 (1999). Ground-launched cruise missiles (GLCM) and their truck-like launch vehicles were employed at bases in Europe; they were withdrawn from service to comply with the 1987 Intermediate-Range Nuclear Forces Treaty. Many of the anti-ship versions were converted into TLAMs at the end of the Cold War. The Block III TLAMs that entered service in 1993 can fly 3 percent farther using their new turbofan engines and use Global Positioning System (GPS) receivers to strike more precisely. Block III TLAM-Cs retain the Digital Scene Matching Area Correlation (DSMAC) II navigation system, allowing three kinds of navigation: GPS-only, which allow for rapid mission planning, with some reduced accuracy, DSMAC-only, which take longer to plan but terminal accuracy is somewhat better; and GPS-aided missions that combine DSMAC II and GPS navigation for greatest accuracy. Block IV TLAMs have an improved turbofan engine that allows them to get better fuel economy and change speeds in flight. The Block IV TLAMs can loiter better and have electro-optical sensors that allow real-time battle damage assessment. The Block IVs can be given a new target in flight and can transmit an image, via satcom, immediately before impact to help determine whether the missile is on target and the likely damage from the attack. Upgrades A major improvement to the Tomahawk is network-centric warfare-capabilities, using data from multiple sensors (aircraft, UAVs, satellites, foot soldiers, tanks, ships) to find its target. It will also be able to send data from its sensors to these platforms. Tomahawk Block II variants were all tested during January 1981 to October 1983. Deployed in 1984, some of the improvements included: an improved booster rocket, cruise missile radar altimeter, and navigation through the Digital Scene Matching Area Corellator (DSMAC). DSMAC was a highly accurate rudimentary AI which allowed early low power computers to navigate and precisely target objectives using cameras on board the missile. With its ability to visually identify and aim directly at a target, it was more accurate than weapons using estimated GPS coordinates. Due to the very limited computer power of the day, DSMAC did not directly evaluate the maps, but instead would compute contrast maps and then combine multiple maps into a