Raytheon Missiles and Defense, Tucson, Arizona, is being awarded a $36,682,667 modification (P00099) to previously awarded contract HQ0276-15-C-0003 to extend the current period of performance.  The value of this contract is increased by $36,682,667 from $2,609,487,245 to $2,646,169,912.  Under this modification, the contractor will:  (1) upgrade, integrate, and test Flight Test Round software; (2) revise environmental qualification plans for compliance with updated qualification standards; (3) facilitate a preliminary qualification event; (4) support an accelerated flight test date; and (5) initiate activities to begin the transition to production.  The work will be performed in Tucson, Arizona.  The performance period is extended from Sept. 30, 2021, to Dec. 31, 2022.  Fiscal 2021 research and development funds in the amount of $35,954,296 are being obligated on this award.  The Missile Defense Agency, Dahlgren, Virginia, is the contracting activity.