The Defense Advanced Research Projects Agency (DARPA) is conducting this Sources Sought to identify contractors who possess the capabilities to provide Program Security Services. Please review the attached Sources Sought Notice and attachments, in its entirety. All interested parties shall submit questions and responses to the Contracting Officer, via e-mail, on or before 5:00 PM Eastern Time on July 24, 2026. Email: programsecurityrequirement@darpa.mil SUBJECT LINE: Sources Sought HR001126QE005 DARPA Program Security Services