The uncertainty surrounding the future of the Atlas V's Russian-built RD-180 engine and an escalating need for the United Launch Alliance to lower its costs in order to meet rising launch competition have pushed ULA to consider the implications of scaling down from two launch vehicle families to just one, a top Boeing space executive told reporters on May 13. ULA, a joint Boeing-Lockheed Martin venture that has served as the Air Force's longtime sole-source lift provider for Evolved Expendable...
