ATAC System Demonstrator also know as Thumper, to receive the 140mm gun tube and a functional rearm port, 1992.
Warren Jones, right, project officer for the U.S. Army, instructs Oak Ridge National Laboratory staff on how an M1 Abrams tank operates in September 1992. From left are Dong-Soo Kwon, Carol Scott, Sam Meacham, Jim Hannah, and Katie Vandergriff.
Katie Vandergriff and Jim Hannah helped develop the ATAC System Demonstrator's rearm port, they also developed the Future Armor Rearm System (FARS).
Compared to it's first appearance (1988), Thumper received weight simulators in the turret, they also changed the mudguards? Or the turret was assembled on another M1A1 chassis. The XM291 gun got removed from the turret to change the gun tube, from the 120mm L/56 (6.75m) gun tube, to the 140mm L/48 (6.75m) gun tube to test the FARS with the new two-piece ATAC 140-mm ammunition.
The ATAC System Demonstrator and the FARS are sitting together at Sierra Army Depot.
Location: 40.2051086922686, -120.13611546011911
ATAC System Demonstrator with the 140mm gun tube and the FARS.