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info; Section IV.4.c, updates the CFR hyperlink; Section IV.4.e, adds language; Section VI.1; updates the proposal formatting language; Section VI.3, updates debriefing language; Section VII, updates the OMBUDSMAN. No other changes are made. SEE ATTACHMENT FOR FULL AMENDMENT DETAILS. Amendment No. 4 to BAA FA8750-23-S-7004 The purpose of this amendment is to: Section III, Paragraph 5, updates S&T Protection language; 2.Section V, paragraph 2.e, updates the language regarding the S&T review SEE ATTACHMENT FOR FULL AMENDMENT DETAILS. Amendment No. 5 to BAA FA8750-23-S-7004 The purpose of this modification is to: Update the NAICS CODE on page 1 to add 541713, as follows: NAICS CODE: 541715 and 541713 It is expected that NAICS code 541713 will apply to Technical Area 2 and Technical Area 3 due to their alignment with Nanotechnology. No other changes are made. SEE ATTACHMENT FOR FULL AMENDMENT DETAILS.