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C Covault, Retooling Rocketry, Aviation Week & Space Technology, 19 July 2004, p 58

In US, discussion continues between Pratt & Whitney and Boeing on a
‘national propulsion company’ aimed at future exploration of deep space. However, this plan is considered controversial by organisations such as the Air Force and Lockheed Martin on the basis that it stifles competition by putting all one¹s eggs in one basket. Hybrid nuclear-electric systems of rocketry will be involved for advanced propulsion. One development of reactant interest is the cryogenic propellant storage technology to permit upper stages to remain fuelled for long periods before use.

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