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Geopolitical and [[Federal government of the United States|US]] [[US Congress|political]] considerations in 2014 led to an effort by ULA to consider the possible replacement of the [[Russia|Russian-supplied]] [[RD-180]] engine used on the first stage booster of the Atlas V. Formal study contracts were issued in June 2014 to a number of US rocket engine suppliers.<ref name=sn20140917/> The results of those studies have led to decisions by ULA to develop a new launch vehicle to replace the Atlas V and Delta IV existing fleet.
The [[Aerojet AR-1]] rocket engine under development as of 2015, is a backup plan to the successor rocket Vulcan, to re-engine the Atlas V.<ref name=AWST-2015-04-15> {{cite news |url= http://aviationweek.com/defense/ula-ceo-calls-2018-availability-date-ar-1-engine-ridiculous |title= ULA CEO Calls 2018 Availability Date For AR-1 Engine ‘Ridiculous’ |author= Amy Butler |date= 15 April 2015 |publisher= Aviation Week }} </ref> In addition to the ULA backup plan, Aerojet and a consortium of companies seek license production or rights to the Atlas V to manufacture it using the AR-1 engine in place of the RD-180.<ref name=SpaceNews-2015-05-12> {{cite news |url= http://spacenews.com/aerojet-led-team-seeks-atlas-5-production-rights/ |title= Aerojet on Team Seeking Atlas 5 Production Rights |date= 12 May 2015 |author= Mike Gruss |publisher= Space News }} </ref>
===== Successor: Vulcan =====
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