Proposals for ASW Tomahawks have been made in the 1970s (Subhawk) and in 1990 (Tomahawk Anti-Submarine Warfare
Capable Missile), but neither got beyond the drawing board. In 1990, General Dynamics revived the anti-submarine Subhawk
concept and models of the new concept, Tomahawk Anti-Submarine Warfare Capable Missile (TACM) were displayed at the 1991
Navy League exhibition in Washington. In July 1991, General Dynamics and the US Navy Undersea Warfare Center began to
consider using Tomahawk as the basis for a long-range ASW system following the abandonment of UUM-125 Sea Lance. A
demonstration study was scheduled for September 1993 but, in May 1992, technical work ceased due to lack of interest in
long-range ASW with the end of the Cold War.
A supersonic land-attack missile, Fasthawk (formerly Cheapshot), with ramjet engine, was considered by Rockwell (later Boeing)
but was abandoned early in 1999. The US Navy is considering a hypersonic missile which might be feasible around 2010 but is also
considering an Advanced Land Attack Missile (ALAM) for the proposed 'Zumwalt' (DD 21) class land-attack destroyers. An
academic/industrial analysis of alternatives was scheduled for FY 2001 with selection of a preferred contractor in FY 2004 and IOC
in FY 2007. The ALAM requirement would probably be addressed by the proposed Joint Supersonic Cruise Missile (JSCM) with a
proposed speed of Mach 3.0 to 4.0 and a range of 500 n miles (925 km). Development costs for the ship- (Mk 41 VLGMLS) and
air-launched missile were put, in mid-2001, at US$1 billion with deployment circa 2012 with unitary and sub-munition payloads.
An Advanced Concept Tactical Demonstrator (ACTD) was proposed for funding in FY02, possibly with a liquid-fuelled ramjet.