The M247 Sgt. Alvin York was pitched to officials and lawmakers alike as a precision shooter in the same vein as its legendary namesake and the silver bullet that would stop all Soviet aircraft — especially the feared Mi-24 Hind attack helicopter — that dared fly too low and close to ground troops.

Instead, it was an expensive boondoggle that couldn’t fight, couldn’t shoot accurately, and couldn’t tell the difference between a toilet and an enemy aircraft.

The M247 came from a requirement for a “Division Air Defense” weapon, a platform that could move forward with armored and infantry divisions and protect them from air-to-ground attacks. But the program was opened when the U.S. was already in the middle of five large weapons programs, and money was tight.

So the military asked manufacturers to keep to a few reasonable rules. Importantly, as much technology as possible needed to come from existing commercial or military surplus sources to keep the weapon relatively cheap to manufacture and maintain.

The winning design came from the Ford Aerospace Communications Corp. and featured two Swedish-made 40mm cannons mounted in a turret and controlled by the Doppler radar from the F-16. The whole thing rode on an M48 Patton tank chassis.

Every part of the weapon had a demonstrated history of performance, and so the anti-aircraft Frankenstein monster was expected to perform. But the F-16’s radar was never designed to deal with the amount of ground clutter that the York would have to deal with. And the M48’s chassis were getting worn out after years of service.

So the first M247s hit the field and performed horribly in tests. They frequently failed to spot targets. Software changes made it more sensitive, but also caused it to start identifying ground clutter as probable enemies.

Second, the old chassis sometimes broke down under the increased weight of the larger York turret and the engines weren’t strong enough to propel the weapon quickly.

In fact, the York weighed 62 tons, 17 tons more than the original Pattons. The extra weight slowed the M247 so much that it couldn’t keep pace with the M1 Abrams tanks and M2 Bradleys that it was designed to primarily protect.

Third, the awesome Swedish cannons on the York provided their own problems. While capable, they were mounted in such a way that a weapon pointing high in the sky would confuse the already troubled radar.

And finally, the weapon wasn’t even accurate. In some tests, it failed to hit helicopters hovering completely still.

So, it couldn’t keep up with the vehicles it escorted, couldn’t properly find low targets because of ground clutter, couldn’t find high targets because of its own gun, and then couldn’t accurately hit anything it could find.

Army and Ford engineers worked hard to iron out the kinks, but they still had to resort to gimmicks like attaching radar-bouncing panels to targets to get the system to pass basic tests.

In one important display, VIPs from the military and Congress were invited to watch the York perform. The system failed to spot its target and instead locked onto something in the stands. It swung its own gun around to track it and several visitors suffered injuries in the scramble to escape the stands.

After total spending of $1.8 billion, the Army had received 65 unsatisfactory weapons and sent the request to the Secretary of Defense for the funding for $417.5 million for another 117 weapons. Secretary of Defense Caspar Weinberger withheld the funds until an ongoing test was completed.

The York once again failed, and Weinberger canceled the program in August 1985.