Strategic Systems Programs (SSP) intends to issue a request for proposal on a sole-source basis in accordance with Federal Acquisition Regulation (FAR) Parts 6 and 15 to The Charles Stark Draper Laboratory, Inc. (CSDL), 555 Technology Square, Cambridge, MA 02139-3539. This effort will add an additional cost-plus-fixed-fee (CPFF) type line item to contract N00030-19-C-0001 to provide technical and engineering support to the Conventional Prompt Strike Program Office for Flight Experiment development efforts, design and integration of the Navigation subsystem into the flight test design, navigation algorithm development refinement and integration, navigation software development and integration, and hardware procurements.  This effort is inextricably linked to work already being performed by CSDL under Contract N00030-19-C-0001, which was awarded using other than full and open competition.  Interested vendors for lower tier subcontracting opportunities should contact this entity.  The solicitation is not intended to be posted on the Government Point of Entry and instead directly with the intended prime contractor in accordance with the sole-source procedures under FAR Part 15.