T118E1 prototype for the M728
U.S. Dept of the Army
<a rel="nofollow" class="external text" href="https://babel.hathitrust.org/cgi/imgsrv/download/pdf?id=uc1.b5107117;orient=0;size=100;seq=653;num=641;attachment=0">Authorization for military procurement, research, and development, fiscal year 1971, and reserve strength</a>, Statement of Brig. Gen. Fred Kornet, Jr., U.S. Army, Assistant Deputy Chief of Staff, pt. 1, p. 641.