155mm Modular Artillery for Combat Effectiveness (MACE)

Amendment 0005 - The purpose of this Amendment 0005 is to resolve the schedule discrepancies identified in the solicitation and provide the definitive baseline for all proposal submissions. Specifically, this amendment: The Government acknowledges the discrepancy between the delivery dates specified in the original Statement of Work (SOW) (Attachment 7) and the performance periods specified in the original MACE CLIN Matrix (Attachment 4), which was caused by the proposal submission extension in Amendment 0001. This Amendment 0005 provides a revised and corrected Statement of Work (SOW) and CLIN Matrix. All schedule milestones have been aligned to relative durations (Months After Agreement Award) to ensure a stable, executable performance period. Amendment 0005 also adds the Updated MACE Questions Addressed plus an updated PPON which lists the amended attachments. The following updated attachments are formally incorporated into the solicitation and replace all previous versions: Attachment 25 Updated Statement of Work (SOW) (Dated 10-6) Attachment 24 Updated MACE CLIN Matrix (Dated 10 6) Attachment 23 Updated MACE Questions Addressed (Dated 10-5) PPON Document MACE Extended Updated Attachments W15QKN 26R1C5R (Dated 10-6) All Offerors shall use the timelines, relative durations, and CLIN structures specified within these amended documents (updated attachments October 5 and 6, 2026) as the sole, definitive basis for their proposal submissions, including their Technical, Schedule (IMS), and Cost/Price volumes. *********************End of Amendment 0005**************************************************************Amendment 0004 - The purpose of amendment 0004 is to update the Question and Answer document from Attachment 15 - Updated MACE Offeror Questions Addressed 9-17 to Attachment 16 - Updated MACE Offeror Questions Addressed 9-24. Amendment 0004 also serves as notification that 6 additional TDP documents have been uploaded to SAM.gov. Vendors who have already been approved for the TDP can access the documents immediately, and those not previously approved may request access through SAM. **********************************************End of Amendment 0004*************************************************Amendment 0003 - The purpose of this amendment 0003 is to add Attachment 15 - Updated MACE Offeror Questions Addressed 9-17 **************End of Amendment 0003**********************************************************Amendment 0002 - The purpose of this amendment 0002 is to add Attachment 15 - MACE Offeror Questions Addressed. *********************End of Amendment 0002 Narrative ******************************************************************************************************************************************************** Amendment 0001 - The purpose of this amendment 0001 is to extend the solicitation response deadline from September 30, 2026 to October 30, 2026. This extension is granted to ensure all potential offerors have sufficient time to conduct thorough analyses, address recent technical clarifications, and submit comprehensive, high-quality proposals which deliver the best value to the Government. As a result of the extension, the Prototype Project Opportunity Notice (PPON) has been revised to reflect the new response deadline. Attachment 1 - Terms and Conditions has been updated in Supplement 5, Sub Section number 2 Outside Funding Contribution Schedule to change the Basic Agreement Years from FY 2026, FY 2027, FY 2028 to FY 2027, FY 2028, FY 2029. ****End of Amendment 0001 Narrative****************************************************************************************************************************** 155mm Modular Artillery for Combat Effectiveness (MACE) - Please refer to Prototype Project Opportunity Notice (PPON) and attachments. Please note: Attachment 8 - Purchase Description and Attachment 9 - Packing and Unitization Drawings will be provided to Offerors upon request once the Offeror signs, completes and submits the following documents for contracting approval: Attachment 12 Technical Data Request Questionnaire; Attachment 6 Non-Disclosure and Non US Agreement plus Attachment 14 DD2345 Military Critical Technical Data Agreement. Please refer to section 8 of the PPON for further information.

Amendment 0004 - The purpose of amendment 0004 is to update the Question and Answer document from Attachment 15 - Updated MACE Offeror Questions Addressed 9-17 to Attachment 16 - Updated MACE Offeror Questions Addressed 9-24. Amendment 0004 also serves as notification that 6 additional TDP documents have been uploaded to SAM.gov. Vendors who have already been approved for the TDP can access the documents immediately, and those not previously approved may request access through SAM. **********************************************End of Amendment 0004*************************************************Amendment 0003 - The purpose of this amendment 0003 is to add Attachment 15 - Updated MACE Offeror Questions Addressed 9-17 **************End of Amendment 0003**********************************************************Amendment 0002 - The purpose of this amendment 0002 is to add Attachment 15 - MACE Offeror Questions Addressed. *********************End of Amendment 0002 Narrative ******************************************************************************************************************************************************** Amendment 0001 - The purpose of this amendment 0001 is to extend the solicitation response deadline from September 30, 2026 to October 30, 2026. This extension is granted to ensure all potential offerors have sufficient time to conduct thorough analyses, address recent technical clarifications, and submit comprehensive, high-quality proposals which deliver the best value to the Government. As a result of the extension, the Prototype Project Opportunity Notice (PPON) has been revised to reflect the new response deadline. Attachment 1 - Terms and Conditions has been updated in Supplement 5, Sub Section number 2 Outside Funding Contribution Schedule to change the Basic Agreement Years from FY 2026, FY 2027, FY 2028 to FY 2027, FY 2028, FY 2029. ****End of Amendment 0001 Narrative****************************************************************************************************************************** 155mm Modular Artillery for Combat Effectiveness (MACE) - Please refer to Prototype Project Opportunity Notice (PPON) and attachments. Please note: Attachment 8 - Purchase Description and Attachment 9 - Packing and Unitization Drawings will be provided to Offerors upon request once the Offeror signs, completes and submits the following documents for contracting approval: Attachment 12 Technical Data Request Questionnaire; Attachment 6 Non-Disclosure and Non US Agreement plus Attachment 14 DD2345 Military Critical Technical Data Agreement. Please refer to section 8 of the PPON for further information.

Amendment 0003 - The purpose of this amendment 0003 is to add Attachment 15 - Updated MACE Offeror Questions Addressed 9-17 **************End of Amendment 0003**********************************************************Amendment 0002 - The purpose of this amendment 0002 is to add Attachment 15 - MACE Offeror Questions Addressed. *********************End of Amendment 0002 Narrative ******************************************************************************************************************************************************** Amendment 0001 - The purpose of this amendment 0001 is to extend the solicitation response deadline from September 30, 2026 to October 30, 2026. This extension is granted to ensure all potential offerors have sufficient time to conduct thorough analyses, address recent technical clarifications, and submit comprehensive, high-quality proposals which deliver the best value to the Government. As a result of the extension, the Prototype Project Opportunity Notice (PPON) has been revised to reflect the new response deadline. Attachment 1 - Terms and Conditions has been updated in Supplement 5, Sub Section number 2 Outside Funding Contribution Schedule to change the Basic Agreement Years from FY 2026, FY 2027, FY 2028 to FY 2027, FY 2028, FY 2029. ****End of Amendment 0001 Narrative****************************************************************************************************************************** 155mm Modular Artillery for Combat Effectiveness (MACE) - Please refer to Prototype Project Opportunity Notice (PPON) and attachments. Please note: Attachment 8 - Purchase Description and Attachment 9 - Packing and Unitization Drawings will be provided to Offerors upon request once the Offeror signs, completes and submits the following documents for contracting approval: Attachment 12 Technical Data Request Questionnaire; Attachment 6 Non-Disclosure and Non US Agreement plus Attachment 14 DD2345 Military Critical Technical Data Agreement. Please refer to section 8 of the PPON for further information.

Amendment 0002 - The purpose of this amendment 0002 is to add Attachment 15 - MACE Offeror Questions Addressed. *********************End of Amendment 002 Narrative ******************************************************************************************************************************************************** Amendment 0001 - The purpose of this amendment 0001 is to extend the solicitation response deadline from September 30, 2026 to October 30, 2026. This extension is granted to ensure all potential offerors have sufficient time to conduct thorough analyses, address recent technical clarifications, and submit comprehensive, high-quality proposals which deliver the best value to the Government. As a result of the extension, the Prototype Project Opportunity Notice (PPON) has been revised to reflect the new response deadline. Attachment 1 - Terms and Conditions has been updated in Supplement 5, Sub Section number 2 Outside Funding Contribution Schedule to change the Basic Agreement Years from FY 2026, FY 2027, FY 2028 to FY 2027, FY 2028, FY 2029. ****End of Amendment 0001 Narrative****************************************************************************************************************************** 155mm Modular Artillery for Combat Effectiveness (MACE) - Please refer to Prototype Project Opportunity Notice (PPON) and attachments. Please note: Attachment 8 - Purchase Description and Attachment 9 - Packing and Unitization Drawings will be provided to Offerors upon request once the Offeror signs, completes and submits the following documents for contracting approval: Attachment 12 Technical Data Request Questionnaire; Attachment 6 Non-Disclosure and Non US Agreement plus Attachment 14 DD2345 Military Critical Technical Data Agreement. Please refer to section 8 of the PPON for further information.

Amendment 0001 - The purpose of this amendment 0001 is to extend the solicitation response deadline from September 30, 2026 to October 30, 2026. This extension is granted to ensure all potential offerors have sufficient time to conduct thorough analyses, address recent technical clarifications, and submit comprehensive, high-quality proposals which deliver the best value to the Government. As a result of the extension, the Prototype Project Opportunity Notice (PPON) has been revised to reflect the new response deadline. Attachment 1 - Terms and Conditions has been updated in Supplement 5, Sub Section number 2 Outside Funding Contribution Schedule to change the Basic Agreement Years from FY 2026, FY 2027, FY 2028 to FY 2027, FY 2028, FY 2029. ****End of Amendment 0001 Narrative*************************************** 155mm Modular Artillery for Combat Effectiveness (MACE) - Please refer to Prototype Project Opportunity Notice (PPON) and attachments. Please note: Attachment 8 - Purchase Description and Attachment 9 - Packing and Unitization Drawings will be provided to Offerors upon request once the Offeror signs, completes and submits the following documents for contracting approval: Attachment 12 Technical Data Request Questionnaire; Attachment 6 Non-Disclosure and Non US Agreement plus Attachment 14 DD2345 Military Critical Technical Data Agreement. Please refer to section 8 of the PPON for further information.

155mm Modular Artillery for Combat Effectiveness (MACE) - Please refer to Prototype Project Opportunity Notice (PPON) and attachments. Please note: Attachment 8 - Purchase Description and Attachment 9 - Packing and Unitization Drawings will be provided to Offerors upon request once the Offeror signs, completes and submits the following documents for contracting approval: Attachment 12 Technical Data Request Questionnaire; Attachment 6 Non-Disclosure and Non US Agreement plus Attachment 14 DD2345 Military Critical Technical Data Agreement. Please refer to section 8 of the PPON for further information.