The Tomahawk Land Attack Missile (TLAM) is a long-range, all-weather, subsonic cruise missile. Introduced by General Dynamics in the 1970s, it was designed as a medium- to long-range, low-altitude missile that could be launched from a submerged submarine. It has been improved several times and, by way of corporate divestitures and acquisitions, is now made by Raytheon. Some Tomahawks were also manufactured by McDonnell Douglas.
There have been several variants of the BGM-109 Tomahawk employing various types of warheads. The operational versions include the unitary conventional land attack TLAM-C, the bomblet-dispensing land attack TLAM-D, the nuclear land attack TLAM-A and TLAM-N, and the Tomahawk Anti-Ship Missile (TASM). Ground Launch Cruise Missiles (GLCM) and their truck-like launch vehicles were destroyed to comply with the 1987 Intermediate-Range Nuclear Forces Treaty.
The Block III TLAMs that entered service in 1993 can fly farther and use Global Positioning System (GPS) receivers to strike more precisely. Block IV TLAMs have a better Digital Scene Matching Area Correlator (DSMAC) system as well as improved turbojet engines. The WR-402 engine provided the new BLK III with a throttle control, allowing in-flight speed changes. This engine also provided better fuel economy. The Block IV Phase II TLAMs have better deep-strike capabilities and are equipped with a real-time targeting system for striking moving targets.