
| AO Release Date................................................................... | November 5, 2014 | 
| Preproposal Conference........................................................ | November 24, 2014 | 
| Notice of Intent to Propose Deadline.................................... | December 5, 2014 | 
| Electronic Proposal Submittal Deadline at 11:59 p.m. Eastern Time................................................... | February 18, 2015 | 
| Letters of Commitment Due (with Proposal)....................... | February 18, 2015 | 
| Deadline for Receipt of Proposal on CD ROMs at 5:00 p.m. Eastern Time..................................................... | February 25, 2015 | 
| Step 1 Selections Announced (target)................................... | June 2015 September 2015 | 
| Initiate Phase A Concept Studies (target)............................. | July 2015 October 2015 | 
| Phase A Concept Study Reports Due (target)...................... | April 2016 July 2016 | 
| Downselection of Investigation(s) for Flight (target)............ | September 2016 December 2016 | 
| Launch Readiness Date.......................................................... | NLT December 31, 2021 |