M48 Chaparral

MIM-72 Chaparral
A Chaparral missile launcher.
Type	Mobile SAM system
Place of origin	United States
Service history
In service	1969–1998 (US)
Used by	See list of present and former operators
Production history
Designed	1965
Unit cost	Launcher vehicle: US$1.5 Million Missile round: US$80,000
Produced	1967
Variants	See list of variants

The MIM-72A/M48 Chaparral was an American self-propelled surface-to-air missile system based on the AIM-9 Sidewinder air-to-air missile system. The launcher is based on the M113 family of vehicles. It entered service with the United States Army in 1969 and was phased out between 1990 and 1998. It was intended to be used along with the M163 VADS, the Vulcan ADS covering short-range short-time engagements, and the Chaparral for longer range use.

Starting in 1959 the U.S. Army MICOM (Missile Command) began development of an ambitious anti-aircraft missile system under their "Forward Area Air Defense" (FAAD) program, known as the MIM-46 Mauler. Mauler was based on a modified M113 chassis carrying a large rotating A-frame rack on top with nine missiles and both long-range search and shorter-range tracking radars. Operation was to be almost entirely automatic, with the operators simply selecting targets from the search radar's display and then pressing "fire". The entire engagement would be handled by the fire control computer.

In testing the Mauler proved to have numerous problems. Many of these were relatively minor, including problems with the rocket motors or fins on the airframe, but others, like problems with the fire control and guidance systems, appeared to be more difficult to solve. Army strategy from the mid-1950s PENTANA study was based on having embedded mobile anti-aircraft capability, and Mauler's delays put this entire program in question. More worrying, a new generation of Soviet attack aircraft was coming into service. For both of these reasons the Mauler program was scaled back in 1963 and alternatives were studied.

MICOM was directed to study whether or not the Navy's AIM-9D Sidewinder missile could be adapted for the ground-to-air role. Since the Sidewinder was guided by an infrared seeker, it would not be confused by ground clutter like the radar-guided Mauler. On the downside, the missile required some time to "lock on", and the current generation seekers were only able to lock onto the tail of an aircraft. MICOM's report was cautiously optimistic, concluding that the Sidewinder could be adapted very quickly, although it would have limited capability.