for both sides as if either side were to make an offensive move, the other side would be capable of countering that move. However, a few years later in 1974 both sides reworked the treaty to include only one ABM defensive system present around an ICBM launch area or the nation's capital city. This occurred once both sides determined the other side was not going to construct a second ABM defensive system. Along with limiting the amount of ballistic missile defense systems each nation could have, the treaty also stated if either country desired to have a radar for incoming missile detection, the radar system must be located on the outskirts of the territory and must be aligned in the opposite direction of one's own country. This treaty would end up being the precedent set for future missile defense programs, as any systems that were not stationary and land-based were a violation of the treaty. 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. In the early 1980s, technology had matured to consider space based missile defense options. Precision hit-to-kill systems more reliable than the early Nike Zeus were thought possible. With these improvements, the Reagan Administration promoted the Strategic Defense Initiative, an ambitious plan to provide a comprehensive defense against an all-out ICBM attack. In pursuit of that goal, the Strategic Defense Initiative investigated a variety of potential missile-defense systems, which included