Amentum Services Inc., Chantilly, Virginia (HR0011-24-D-0101); Booz Allen Hamilton, McLean, Virginia (HR0011-24-D-0102); ECS Federal LLC, Fairfax, Virginia (HR0011-24-D-0103); ManTech SRS Technologies Inc., Herndon, Virginia (HR0011-24-D-0104); Strategic Analysis Inc., Arlington, Virginia (HR0011-24-D-0105); and Systems, Planning, and Analysis Inc., Alexandria, Virginia (HR0011-24-D-0106), were each awarded an indefinite-delivery /indefinite-quantity contract for a maximum amount of $1,250,000,000 (total sum among all six contractors) with cost-reimbursable, fixed-price, and labor-hour task orders for technical and analytical support services. This contract provides for a range of high-level advisory and assistance services to all Defense Advanced Research Projects Agency technical and support offices. Work will be performed in Arlington, Virginia, with an expected completion date of October 2028. No funds are being obligated at the time of award. These contracts were a competitive acquisition under solicitation HR001123R0001, and 12 offers were received. DARPA, Arlington, Virginia, is the contracting activity.