Found information about STAM (Submarine Tactical Missile) or UGM-89 Perseus:
http://www.designation-systems.net/dusrm/m-89.html
In March 1969, the U.S. Navy issued a requirement for the STAM (Submarine Tactical Missile), a new submarine-launched dual role (anti-sub/anti-ship) attack missile. It was to have a range between 9 km (5 nm) and 55 km (30 nm), and carry a new high-performance homing torpedo. STAM was to be a large missile with a length of about 7.6 m (300 in) and a diameter of 76 cm (30 in). This made it too large for torpedo tubes, and therefore a new attack submarine (SSN) type was proposed which would carry 20 STAMs in vertical launch tubes. This new SSN would have been much larger, and therefore much more expensive, than existing SSN classes. The STAM project and the new submarine class were eventually cancelled in 1973. As a replacement, the submarine-launched UGM-84 version of the Harpoon missile was developed and fielded on existing SSNs.
http://www.designation-systems.net/dusrm/m-89.html