It first flew on 11 October 1960 , and was deployed as an operational ICBM from September 1961 until April 1966 .
The SM - 65E Atlas , or Atlas - E , was an operational variant of the Atlas missile .
SM - 65E Atlas first flew on 11 October 1960 , and was deployed as an operational ICBM from September 1961 until April 1966 .
The SM - 65E Atlas , or Atlas - E , was an operational variant of the Atlas missile .