Booz Allen Hamilton, McLean, Virginia (HDTRA1-19-D-0002); General Dynamics Information Technology, Fairfax, Virginia (HDTRA1-19-D-0003); Leidos Inc. Reston, Virginia (HDTRA1-19-D-0004); Next Tier Concepts Inc. Vienna Virginia (HDTRA1-19-D-0005); and Science Applications International Corp., Reston, Virginia (HDTRA1-19-D-0006), are each awarded indefinite-delivery/indefinite-quantity (ID/IQ) contracts. These contracts provide Defense Threat Reduction Agency (DTRA)-wide information technology support services for IT service design. The not-to-exceed aggregate ceiling for all contracts is $535,000,000, with the contractors having an opportunity to compete for individual orders. This is a five-year base contract with one five-year option period. The bids were solicited through the Federal Business Opportunities website, with five offers received. Work will be performed at Fort Belvoir, Virginia, however, DTRA maintains a global mission, and contractor personnel may be required to work at locations other than Fort Belvoir. Performance is expected to be completed March 2029. No funds are being obligated at time of ID/IQ award; funds will be obligated on individual orders as they are issued. Task Order 1 is being awarded to Leidos Inc. at $18,058,969 for IT solution engineering and systems test support. Task Order 2 is being awarded at $22,113,142 for knowledge management solutions and support. Task Orders 1 and 2 will have a one-year base and four one-year options. The contracting activity is the Defense Threat Reduction Agency, Fort Belvoir, Virginia.