Leidos Inc., Reston, Virginia, is awarded a $9,964,864 cost-plus-fixed-fee contract for contractor support to operate and maintain the active and passive sonar systems necessary to provide mobile undersea acoustic surveillance capabilities. Foreign Military Sales funds in the amount of $994,036 will be obligated at the time of award. Funding will not expire at the end of the fiscal year. Work will be performed in Yokohama, Japan (84%); Virginia Beach, Virginia (15%); and Reston, Virginia (1%). Work is expected to be completed by February 2022. This contract was not competitively procured because it is a sole source acquisition pursuant to the authority of 10 U.S. Code 2304(c)(1) — only one responsible source in accordance with Federal Acquisition Regulation subpart 6.302-1. The Naval Information Warfare Systems Command, San Diego, California is the contracting activity (N00039-21-C-9003).