"On 4 October 1957, the USSR successfully launched the Sputnik-1 earth satellite into space - an achievement that stunned the American public and press but not the US policy and intelligence communities. CIA's Office of Scientific Intelligence (OSI), which was responsible for analyzing the USSR's satellite and missile programs, had reported on the advancements that would lead to this landmark event. As early as 1955, OSI had alerted President Eisenhower to the Soviet program through briefings and finished intelligence products. In June 1957, OSI reported that a Soviet launch of an earth satellite was imminent, noting this capability portended the USSR's production of intercontinental ballistic missiles (ICBMs) capable of reach the US."
I wouldn't focus to closely on the EO, a ton of CIA docs are marked with this since the EO was passed by Obummer.