(a) Contracting officers must document the contract file with the justification for the delay and revised definitization milestone schedule for UCO actions >$5M. For UCO approval authorities see MP5301.601(a)(i) .

(1) This date may not be extended beyond an additional 90 days without a written determination by the Head of the Contracting activity (HCA) for actions >$50M without further delegation and the Senior Contracting Official (SCO) with further delegation no lower than the Chief of the Contracting Office (COCO) for UCOs between $5M and $50M.