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DMSP Block 4

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AKA: 5 satellites.

The first CORONA photos in August 1960 convinced authorities that knowledge of cloud cover over Russia was necessary and could be obtained only via satellite. Since the civilian TIROS program could not yet meet the requirement, the Director, National Reconnaissance Office (DNRO) authorized an interim program.

Launched by "Blue-Scout" boosters, the system would operate for one year until TIROS could take over. Program II began officially on 1 August 1961. Colonel Thomas Haig accepted the program director's position on three conditions: that he could use fixed-price, firm-schedule contracts; that he could select the personnel for his program office; and, that he did not have to use a civilian system engineering and technical direction (SE&TD) contractor. When TIROS delays persisted, Program II continued as Program 35. Confronted by problems of operating the meteorological satellites within the ground system designed for CORONA, Haig proposed two dedicated ground stations and a separate control center operated solely by Air Force personnel-no contractors. Ten months later the nation's first operational satellite program manned entirely by Air Force military personnel became a reality.

After the "Blue Scout" booster proved inadequate, Haig proposed refurbishing Thor intermediate-range ballistic missiles (IRBMs) and adding a second stage plus parts from other boosters to create a new launch vehicle. The latter, dubbed "Burner I," solved the booster problems and simultaneously provided a convenient way to dispose of an embarrassing excess of Thors returned from Europe. No longer an "interim" effort, the military weather satellite received yet another name-Program 417. Its use was expanded to provide information on cloud cover for aircraft flights during the Cuban missile crisis, the evacuation of civilians from the Congo, and air operations in Vietnam.

Haig and his "blue-suit" crew were deeply involved in engineering and development aspects of the program. They designed essential parts for the Burner boosters, invented magnetic spin-rate control of the satellite, conceived and introduced innovations which greatly reduced the cost of ground stations, and developed simplified tracking software. The precedents established and attitudes generated in Haig's program office persisted long after the military meteorological satellite program was declassified and dubbed the Defense Meteorological Satellite Program (DMSP).

DMSP Block 4A American earth weather satellite. Defense Meteorological Satellite Program. Meteorology satellite built by RCA Astro for USAF, NRO, USA. Launched 1966 - 1967.

DMSP Block 5A American earth weather satellite. Defense Meteorological Satellite Program. Meteorology satellite built by RCA Astro, USA. Launched 1970 - 1971.

DMSP Block 5B American earth weather satellite. Defense Meteorological Satellite Program. Meteorology satellite built by RCA Astro, USA. Launched 1971 - 1974.

DMSP Block 5C American earth weather satellite. Defense Meteorological Satellite Program. Meteorology satellite built by RCA Astro, USA. Launched 1974 - 1976.