Comtech EF Data, Tempe, Arizona, is awarded a $13,132,880 contract modification under an existing firm-fixed-price, indefinite-quantity/indefinite-delivery contract (N00039-18-D-0007) for Comtech SLM-5650B modems, SLM-5650B modem upgrade kits, firmware upgrades, and technical support services. The commercially available modems support satellite communications and interoperability across Navy platforms and shore sites. The contract action will increase the ceiling values of existing firm-fixed-price line items by $13,132,880, increasing the current contract value from $58,812,559 to $71,945,439. Contract actions will be issued and funds obligated as individual delivery orders. Funds will be placed on contract with a production delivery order issued after award of the contract modification. Work will be performed in Tempe, Arizona, and is expected to be completed by March 2023. This sole-source contract was not competitively procured in accordance with 10 U.S. Code 2304(c)(1) — only one responsible source, per Defense Federal Acquisition Regulation subpart 6.302-1). The Naval Information Warfare Systems Command, San Diego, California, is the contracting activity.