Mar 27 1958
From The Space Library
President Eisenhower gave his approval to the plans for outer space exploration announced by Secretary of Defense Neil H. McElroy. The Advanced Research Projects Agency (ARPA) was to undertake several space projects including the launching of certain earth satellites and five space probes as a part of this country's contribution to the IGY program. The Air Force Ballistic Missile Division was authorized by ARPA to carry out three lunar probes with a Thor-Vanguard system, and lunar probes utilizing the Jupiter-C rocket were assigned to the Army Ballistic Missile Agency.
The Advanced Research Projects Agency authorised the Army Ballistic Missile Agency to proceed with an unmanned lunar mission. (Memo (PDF)