the question i have is do i have to do a full MS-B to MS-C for the next gen system if the requirements from the CDD have not changed? essentially by pulling technology to the left we are meeting some of the requirements that we could not meet in the CDD previously
In general, "no", if CDD requirements have not changed and if the changes to the fielded system are not radical (as in this case of a new open system sensor), most Milestone Decision Authorities/Decision Authorities will not require a repeat of the entire MS-B/MS-C process. However, the final decision will be made by the MDA/DA. But the MDA/DA will most likely depend strongly on the recommendation of the Program Manager who should recommend skipping the Engineering and Manufacturing Development (E&MD) phase (between MS-B and MS-C) for this change.