Northrop Grumman Corp., Chandler, Arizona, is being awarded a $48,192,076 firm-fixed-price modification to a previously awarded other transaction prototype agreement to extend the existing period of performance. Under this modification, the performer will continue to develop and refine their Glide Phase Interceptor concept during the Materiel Solutions Analysis Phase. The work will be performed in Chandler, Arizona. The modification period of performance is from Feb. 28, 2023, through July 31, 2023. The modification increases the total value of the agreement to $126,298,508. This initial agreement was competitively awarded using Other Transaction Authority provided by 10 U.S. Code 4022 through the Enhanced Hypersonic Defense Broad Agency Announcement with Glide Phase Interceptor Special Topic, HQ0851-21-S-0001. Research, development, test, and evaluation funds will be used to fund the modification, with $48,192,076 obligated at the time of award. The Missile Defense Agency, Dahlgren, Virginia, is the contracting activity (HQ08512290002).