NRO Sigint Launch To Be Last for Pratt & Whitney RL10 Version Engine
RETIRING ENGINE The planned USAF launch this week of a secret National Reconnaissance Office signals intelligence spacecraft on a Titan IVB-Centaur will mark the last use of one of the older versions of the Pratt & Whitney RL10 oxygen/hydrogen engine used on the Centaur upper stage. The $1.5-billion...
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