 A similar program was proposed in the United Kingdom during the 1960s.A "Time" magazine article in the 14 November 1960 issue outlined a new program supplementing the then "basically unsound" warning system consisting of localized sirens and the CONELRAD radio-alert system.The U.S. Army argued that in the age of intercontinental ballistic missiles a civil-defense warning system should be capable of warning 90% of the population within 30 seconds after a signal is given by the national civil-defense center in Colorado Springs.