Northrop Grumman Corp., Chandler, Arizona, is being awarded a firm-fixed-price modification to a previously awarded other transaction prototype agreement to extend the existing period of performance. The value of this modification is $17,821,784, which increases the total value of the agreement to $78,106,432. 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 Nov. 16, 2022, through July 2, 2023. 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. The government will obligate in the amount of $5,940,595 at the time of award. The Missile Defense Agency, Dahlgren, Virginia, is the contracting activity (HQ08512290002).