Cold War defense tech ad from 1988.
This was the Hypervelocity Missile (HVM), a Mach 4 weapon for the A-10 Warthog that used a penetrating rod to disable armored vehicles. It lacked a warhead and seeker, keeping per-unit costs to a minimum.
It was guided, though.
The shooting aircraft's targeting pod used a laser command guidance link to automatically send target position updates to the missile to the point the targeting pod was tracking. Your read that right: it was the laser version of Russia's SA-2/SA-3 radar SAM command-guidance logic.
The HVM started in 1981 and had concept test shots in 1983...but was cancelled in ~1988.
HVM evolved to become the MGM-166 KEM (Kinetic Energy Missile) for the Army. The missile went through another decade of demonstration and development and was ready for production but was cancelled in 2004—a victim of GWOT.