As a result of the treaty and of technical limitations, along with public opposition to nearby nuclear-armed defensive missiles, the U.S. Sentinel program was re-designated the Safeguard Program, with the new goal of defending U.S. ICBM sites, not cities. The U.S. Safeguard system was planned to be implemented in various sites across the US, including at Whiteman AFB in Missouri, Malmstrom AFB in Montana, and Grand Forks AFB in North Dakota. The Anti-Ballistic Missile Treaty of 1972 placed a limit of two ABM systems within the US, causing the work site in Missouri to be abandoned, and the partially-completed Montana site was abandoned in 1974 after an additional agreement between the US and USSR that limited each country to one ABM system. As a result, the only Safeguard system that was deployed was to defend the LGM-30 Minuteman ICBMs near Grand Forks, North Dakota. However, it was deactivated in 1976 after being operational for less than four months due to a changing political climate plus concern over limited effectiveness, low strategic value, and high operational cost.