"With the first production vehicles being delivered in late 1983 many problems remained, the most serious being the radar's inability to track low flying targets due to excessive ground clutter. The radar could not distinguish between a hovering helicopter and a clump of trees. And when tracking high flying targets, the radar return from the gun barrel tips confused the fire control system. Turret traverse was also too slow to track a fast crossing target. The ECM (electronic counter-measures) suite could be defeated by only minor jamming. And the use of the 30 year old M48 chassis design meant the vehicle had trouble keeping pace with the newer M1 Abrams and M2/3 Bradley's, the very vehicles it was designed to protect.
"These problems proved insurmountable, and in December 1986 after about 50 vehicles had been produced the entire program was terminated."