Final RFP Engineering Services and Science Capability Augmentation (ESSCA) II

**Modification 6: The purpose of this modification is to post Amendment 00004 to the 80MSFC26R0002 ESSCA II solicitation. **

File 2026 07 23__ Amendment 00004 80MSFC26R0002 Amendment 00003 to Amendment 00004 Appendix C Change Log.pdf provides a list of changes made between issuance of Amendment 00003 and the issuance of Amendment 00004.

Additionally, as part of this amendment the following solicitation files replace prior versions as a result of changes to the 80MSFC26R0002 solicitation, as noted in Block 14 of file 2026 07 23 _Amendment 00004 80MSFC26R0002 SF30.pdf:

2026 07 23 __Amendment 00004 80MSFC26R0002 Sections J-M.docx

2026 07 23__Amendment 00004 80MSFC26R0002 Attachment L-1 Excel Pricing Model.xlsx

Offerors are responsible for downloading their own copy of the amended solicitation in its entirety. Furthermore, it also remains each offeror's responsibility to continue monitoring sam.gov for any future amendment(s) to this solicitation. As part of any resultant proposal submission, offerors shall acknowledge receipt of all solicitation amendment(s) as required by the solicitation.

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**Modification 5: The purpose of this modification is to post Amendment 00003 to the 80MSFC26R0002 ESSCA II solicitation and to provide an ESSCA II RFP Amendment 00001 to Amendment 00003 Clause and Provision Change Matrix. NOTE: This amendment requires full submission (or resubmission) of proposals from potential Offerors. **

The primary purpose of Amendment 00003 is to communicate the potential impact of NASA's February 6, 2026, Workforce Directive on the ESSCA II solicitation. This amendment also incorporates the capability to place firm-fixed-price orders under the skills augmentation portion of the ESSCA II scope. Interested parties are encouraged to review file 2026 07 06__Amendment 00003 80MSFC26R0002 Cover Letter with Appendix A,B.pdf and file 2026 07 06_Amendment 00003 80MSFC26R0002 SF30.pdf for additional information.

NOTE: As a result of this change, the due date for proposal submission has been extended to August 6, 2026, 2:00 p.m. Central Time.

File 2026 07 06__ 80MSFC26R0002 Amendment 00002 to Amendment 00003 Appendix C Change Log.pdf provides a list of changes made between issuance of Amendment 00002 and the issuance of Amendment 00003.

Additionally, as part of this amendment the following solicitation files replace prior versions as a result of changes to the 80MSFC26R0002 solicitation, as noted in Block 14 of file 2026 07 06 _Amendment 00003 80MSFC26R0002 SF30.pdf:

2026 07 06__Amendment 00003 80MSFC26R0002 ESSCA II RFP Sections A-I.pdf

2026 07 06 __Amendment 00003 80MSFC26R0002 Sections J-M.docx

2026 07 06__Amendment 00003 80MSFC26R0002 Attachment L-1 Excel Pricing Model.xlsx

This posting also provides an ESSCA II Amendment 00001 to Amendment 00003 Clause and Provision Change Matrix. (Note: No changes impacting this matrix were published in Amendment 00002.) This matrix is provided to assist potential offerors in navigating FAR and NFS clause and provision updates resulting from the Revolutionary FAR Overhaul (RFO) and associated Procurement Class Deviations (PCD). This matrix is not an official Agency guidance document but is provided to assist in assessing impacts to the ESSCA II Amendment 00001 which was released February 23, 2026. The matrix may not capture every change resulting from the RFO and associated PCDs. Interested parties are under no obligation to use or rely on the information provided in this matrix. The ESSCA II final 80MSFC26R0002 RFP, inclusive of any amendments that may be published, takes precedence over the information provided in this matrix.

Offerors are responsible for downloading their own copy of the amended solicitation in its entirety. Furthermore, it also remains each offeror's responsibility to continue monitoring sam.gov for any future amendment(s) to this solicitation. As part of any resultant proposal submission, offerors shall acknowledge receipt of all solicitation amendment(s) as required by the solicitation.

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Modification 4: The purpose of this modification is to alert interested parties that NASA intends to issue a significant amendment to 80MSFC26R0002 ESSCA II addressing the potential impact of NASA’s February 6, 2026, Workforce Directive: Restoring NASA’s Core Competencies. This amendment will require new submission (or resubmission) of proposals from any potential Offerors.

In addition, NASA is assessing the potential impact of recent Executive Order 14402 "Promoting Efficiency, Accountability, and Performance in Federal Contracting”, released on April 30, 2026, on 80MSFC26R0002 ESSCA II. Impact to ESSCA II, if any, could be identified either as part of a combined solicitation amendment addressing both the Workforce Directive and Executive Order, or separate amendment as appropriate.

All interested parties are encouraged to continue monitoring SAM.gov for acquisition updates.

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Modification 3: The purpose of this modification is to post Amendment 00002 to the 80MSFC26R0002 ESSCA II solicitation and to provide an ESSCA II RFP to Amendment 00001 Clause and Provision Change Matrix.

The primary purpose of Amendment 00002 is to provide an update to Attachment L-1 Excel Pricing Model as further defined in Block 14 of the Amendment 00002 SF30.

As a result of this change, the due date for proposal submission has been extended to Monday, March 16, 2026, 2:00 p.m. Central Time.

This posting also provides an ESSCA II RFP to Amendment 00001 Clause and Provision Change Matrix. This matrix is provided to assist potential offerors in navigating FAR and NFS clause and provision updates resulting from the Revolutionary FAR Overhaul (RFO) and associated Procurement Class Deviations (PCD). This matrix is not an official Agency guidance document but is provided to assist in assessing impacts to the ESSCA II RFP which was released January 30, 2026. The matrix may not capture every change resulting from the RFO and associated PCDs. Interested parties are under no obligation to use or rely on the information provided in this matrix. The ESSCA II final 80MSFC26R0002 RFP, inclusive of any amendments that may be published, takes precedence over the information provided in this matrix.

Offerors are responsible for downloading their own copy of the amended solicitation in its entirety. Furthermore, it also remains each offeror's responsibility to continue monitoring sam.gov for any future amendment(s) to this solicitation. As part of any resultant proposal submission, offerors shall acknowledge receipt of all solicitation amendment(s).

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**Modification 2: **The purpose of this modification is to post Amendment 00001 to the 80MSFC26R0002 ESSCA II solicitation.

The primary purpose of Amendment 00001 is to respond to industry questions and comments in relation to the ESSCA II solicitation. File 2026 02 23__Amendment 00001 80MSFC26R0002 Appendix C RFP Questions and Responses.pdf provides responses to questions and comments.

File 2026 02 23__Amendment 00001 80MSFC26R0002 Final RFP to Amendment 00001 Appendix D Change Log.pdf provides a list of changes made between issuance of the RFP on January 30, 2026, and the issuance of 80MSFC26R0002 Amendment 00001.

Additionally, as part of this amendment the following solicitation files are revised as noted in Block 14 of file 2026 02 23_Amendment 00001 80MSFC26R0002 SF30.pdf.

• 2026 02 23__Amendment 00001 80MSFC26R0002 ESSCA II RFP Sections A-I.pdf

• 2026 02 23__Amendment 00001 80MSFC26R0002 Sections J-M.docx

• 2026 02 23__Amendment 00001 80MSFC26R0002 Attachment L-5-A Incumbent WYEs and Average Unburdened Hourly Direct Labor Rates.pdf

Note: This file is accessible only via the controlled documents section of this posting.

Offerors are responsible for downloading their own copy of the amended solicitation in its entirety. Furthermore, it also remains each offeror's responsibility to continue monitoring sam.gov for any future amendment(s) to this solicitation. As part of any resultant proposal submission, offerors shall acknowledge receipt of all solicitation amendment(s).

Modification 1: The purpose of this modification is to post an ESSCA II Draft RFP to Final RFP Clause and Provision Change Matrix. See attachments section of this posting.

This matrix is provided to assist potential offerors in navigating FAR and NFS clause and provision updates resulting from the Revolutionary FAR Overhaul (RFO) and associated Procurement Class Deviations (PCD). This matrix is not an official Agency guidance document but is provided to assist in assessing impacts to the ESSCA II draft request for proposal (RFP) which was released September 30, 2025. The matrix may not capture every change resulting from the RFO and associated PCDs; therefore, the Offerors may submit relevant questions to the Agency by February 10, 2026, 2:00 p.m., Central Time. Interested parties are under no obligation to use or rely on the information provided in this matrix. The ESSCA II final 80MSFC26R0002 RFP, inclusive of any amendments that may be published, takes precedence over the information provided in this matrix.

All other information in this posting remains unchanged.

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You are invited to submit a proposal in response to the National Aeronautics and Space Administration (NASA) George C. Marshall Space Flight Center’s (MSFC) Engineering Services and Science Capability Augmentation (ESSCA) II solicitation.

The principal purpose of the ESSCA II contract is to provide engineering and science capability skills augmentation support and related services to MSFC, including the Michoud Assembly Facility (MAF), and Stennis Space Center. The contract will include the capability to provide limited skills augmentation support to NASA Headquarters and all other NASA Centers. The contract will also provide scope for MSFC end-item deliverable requirements.

NASA will conduct this acquisition as a full and open competition. The North American Industry Classification System (NAICS) code for this acquisition is 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology), Exception 3 Guided Missiles and Space Vehicles, Their Propulsion Units and Propulsion Parts, and the small business size standard is 1,300 employees.

This competitive acquisition will result in a hybrid indefinite-delivery, indefinite-quantity (IDIQ) contract with the ability to issue cost-plus-award-fee (CPAF), cost-plus-fixed-fee (CPFF), and firm-fixed-price (FFP) orders. The contract consists of a four-month phase-in period, a five-year base ordering period, with an option for a three-year additional ordering period.

All questions regarding this RFP should be submitted in writing, electronically to Sadie Moulton, Contracting Officer, at sadie.m.moulton@nasa.gov and courtesy copy Erin Richardson, SEB Chair, at erin.h.richardson@nasa.gov on or before February 10, 2026, 2:00 p.m. Central Time (CT). Offerors are encouraged to submit questions as soon as possible for consideration.

NASA Clause 1852.215-84, Ombudsman, is applicable. The Center Ombudsman for this acquisition can be found at: https://www.hq.nasa.gov/office/procurement/regs/Procurement-Ombuds-Comp-Advocate-Listing.pdf.

In accordance with NFS 1815.201(f), a “Blackout Notice” has been issued to NASA personnel. All inquiries/communications pertaining to this acquisition shall be directed only to the Contracting Officer.