DOE/NNSA Clearance Action Tracking System (CATS) Development & Maintenance Support Services.

Amendment #10 is issued to revise DOE-L-2015 Offer Acceptance Period (OCT 2015) from: �The offeror's proposal shall be valid through September 8, 2026, which is 365 calendar days after the required due date for proposals.� To: �The offeror's proposal shall be valid through January 6, 2027, which is 485 calendar days after the required due date for proposals.� All offerors desiring to extend their proposals are hereby requested to sign Amendment 10 and return the signed amendment via email to tamra.ortiz@nnsa.doe.gov and Samantha.sartori@nnsa.doe.gov no later than 0800 August 25, 2026. By signing and returning Amendment 10, Offerors agree to extend their offers through January 6, 2027. Failure to sign and return Amendment 10 will result in an Offeror�s proposal being removed from further consideration under this procurement. At this time the Government is not inviting nor accepting proposal revisions. An Offeror�s submission of a revised proposal will result in the Offeror�s proposal being removed from further consideration under this procurement. Period of Performance: 03/09/2026 to 03/08/2031