feb 13, 2013 - Phase 1 (amended)

Description:

"allowed the Air Force to procure up to 35 launch vehicle cores (a core is the main rocket body; the Delta IV Heavy consists of three cores) over a five year ordering period, 2013-2017 and provide the associated launch capability from 2013-2019. The Air Force awarded a sole source contract with a requirements type component to United Launch Alliance (ULA) that provided a long-term commitment in exchange for much lower launch service prices and substantial manifest flexibility. This contract with ULA was deemed to be “Phase 1” of the EELV program."
https://www.afspc.af.mil/About-Us/Fact-Sheets/Article/249026/evolved-expendable-launch-vehicle/

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