Booz Allen Hamilton Inc., McLean, Virginia, is being awarded a $9,887,466 ceiling cost-plus-fixed-fee option modification (P00045) to provide advisory and assistance services in support of the Cooperative Threat Reduction Program. This extension modification has a four month period of performance. The effective date is May 26, 2021. Work will be performed in Lorton, Virginia; and Fort Belvoir, Virginia, with an expected completion date of Sept. 26, 2021. Fiscal 2019 and 2021 Cooperative Threat Reduction funds in the amount of $2,403,655 are being obligated at time of award. This award was a sole source acquisition pursuant to Federal Acquisition Regulation (FAR) 6.302-1 Only One Responsible Source, and the contract’s clause FAR 52.217-8 Option to Extend Services. The Defense Threat Reduction Agency, Fort Belvoir, Virginia, is the contracting activity (HDTRA1-16-C-0012).