Atlas V Launch Services – User's Guide. (PDF; 27 MB) March 2010 Revision 11. United Launch Alliance, März 2010, S. 1–3, abgerufen am 31. Dezember 2018 (englisch): „The Atlas V Heavy Lift Vehicle has been developed up to a Critical Design Review (CDR) level of completeness. The completion of the design is currently on hold pending firm mission requirements for this level of performance capability. At the time of this publication, the Atlas V HLV is approximately 30 months from authority to proceed (ATP) to launch, but would require a 36-month integration cycle[...]“
Roy Miller: Dual Spacecraft System. (PDF) United Launch Alliance, 2011, abgerufen am 14. April 2019 (englisch).
Atlas V USSF 8.United Launch Alliance, abgerufen am 25. Januar 2022 (englisch): „Unique to this mission is the first and only planned flight of the Atlas V 511 configuration.“