HBG II Hybrid FRFP Cover Letter Rev 1

National Aeronautics and Space Administration
Goddard Space Flight Center
Greenbelt, MD 20771

10/22/2026
Reply to Attn of:

TO:

All Potential Offerors

SUBJECT:

Request for Proposal (RFP), Solicitation No. 80GSFC27R0015, for Hydrosphere, Biosphere and Geophysics (HBG) Support Services II

You are invited to submit a proposal in response to the National Aeronautics and Space Administration (NASA) Goddard Space Flight Center (GSFC), Hydrosphere, Biosphere and Geophysics (HBG) Support Services II solicitation. The principal purpose of this requirement is to provide science research that conceives, develops, and applies space, field-deployed (i.e. airborne and in situ) and laboratory based technologies and observations to address issues of importance to society. These include but are not limited to water resources, land and ocean ecosystems, global and regional sea level change, changes in the Earth’s cryosphere, gravity field, magnetic field, solid Earth, and the terrestrial reference frame. The Statement of Work, Attachment A, describes the scope of the requirement. This contract is for support of a full range of science and research activities across the breadth of the various Laboratories that make up the HBG sub-division: the Cryospheric Sciences, Ocean Ecology, Hydrological Sciences, Biospheric Sciences, and Geodesy and Geophysics Laboratories. This contract is also for support of science, research and computing activities within the Terrestrial Information Systems Laboratory (TISL), also in the ESD. For the purposes of this document and contract the term HBG will be used to encompass all the Laboratories of the HBG subdivision and the TISL. NASA will conduct this acquisition as a small business set-aside, competition. The North American Industry Classification System (NAICS) code for this acquisition is 541715 and the small business size standard is 1,000.
This competitive acquisition was originally contemplated as a Cost-Plus-Fixed-Fee (CPFF), Indefinite-Delivery/Indefinite-Quantity (IDIQ) contract with the ability to issue CPFF task orders. Following further acquisition planning and assessment of the Government's requirements, the contract structure has been modified. The HBG II Draft Request for Proposal (DRFP) posted on April 8, 2025 was issued as an IDIQ CPFF solicitation. As amended, this competitive acquisition will now result in a HYBRID Indefinite Delivery Indefinite Quantity (IDIQ) with the ability to issue Cost Plus Rev.: 06/2026

Fixed Fee (CPFF) AND Firm- Fixed Price (FFP) task orders. The contract will have an