Senate Passes FY2016 Defense Authorization, But Blocked on Defense Appropriations, Space Policy Online
"The Air Force is trying to convince Congress to give it a few more years to make the transition, arguing that it needs more time to develop, test and certify a new launch system (of which an engine is part). It wants an extension to 2022. The House-passed FY2016 NDAA provides that flexibility, but the Senate bill insists on 2019. The RD-180 and launch competition issues have become entwined. ULA has been a monopoly provider of launch services to the Air Force and intelligence community since it was created in 2006, but now a competitor, SpaceX, has emerged. DOD, the Air Force and ULA assert that they embrace the drive for competition, but want to make certain SpaceX does not itself become a monopoly provider in the 2019-2022 time frame when Atlas V's no longer can be launched (because RD-180s are prohibited), but a ULA alternative is not ready. These issues not only split the House and Senate authorizing committees, but the Senate authorizing and appropriations committees. McCain's Senate Armed Services Committee (SASC) is the one holding DOD's feet to the fire on 2019, while the other three are siding with DOD."
Knights Templar Inspired Business Moves at ULA, earlier post