The Air Force has released a formal request for proposals to develop a new rocket-propulsion system -- and while the service intends to ultimately develop at least two alternatives to replace the Atlas V launch vehicle, it has made room for flexibility in its acquisition strategy should Congress direct it to take an engine-centric approach. The RFP , which was posted June 2 to the Federal Business Opportunities website, will initiate an 18-month effort to develop U.S.-made propulsion system prototypes...
