The U.S. Army had largely assumed the tactical ground launched nuclear missile program until the 1980s when TAC's BGM-109G "Gryphon" ground launched cruise missile (GLCM) was deployed along with the Army's Pershing II ballistic missile to counter the mobile medium- and intermediate- range ballistic nuclear missiles deployed by the Soviet Union in Eastern Bloc countries. This entire class of weaponry was eliminated by the 1987 Intermediate-Range Nuclear Forces Treaty (INF treaty) and removed by 1990, thus reducing both the number and the threat of nuclear warheads.