The concept of airborne surveillance of enemy ground forces with a Ground M
oving Target Indicator [now called GMTI] radar capable of detecting moving
ground vehicles and helicopters was proposed in 1968 and resulted in a DoD
program to realize its potential. This article traces the program history s
tarting with the Army's Stand Off Target Acquisition System [SOTAS] as it e
volved through the Small Aerostat Surveillance System [SASS] and the Assaul
t Breaker/Pave Mover programs into the currently fielded Joint Surveillance
and Target Attack System [JointSTARS], which, in prototype form, more than
proved its worth in the 1991 Gulf War, New developments and trends in GMTI
radars are also discussed together with other potential platforms. Referen
ce [1] should he considered an integral portion of the story of the evoluti
on of JointSTARS; it appeared earlier in a sister journal.