Raytheon Co., Space and Airborne Systems, Marlborough, Massachusetts, is awarded a $91,006,566 24 month modification to continue the performance of engineering services and provide spares in support a previously awarded contract (N00039-16-C-0050) for Navy Multiband Terminals (NMT) issued by the Naval Information Warfare Systems Command. This modification increases the value of the basic contract by $91,006,566; the new total value of the contract is $648,888,687. This modification will allow for tasking on a cost-plus-fixed-fee and firm-fixed-price basis associated with testing, obsolescence, technical support, and NMT terminal deliveries. The engineering services will also include software maintenance (e.g., recurring security patches and corrections to latent defects) and hardware repairs of Fleet and laboratory Lowest Replaceable Units for extended lifecycle sustainment purposes, as well as hardware redesign to address obsolescence of system parts. These services will also include studies and design changes, potentially both hardware and software, to support interface changes required for connection to and operation with externally connected systems, external modems and other baseband equipment, time/frequency distribution systems, and navigation systems. These studies and design changes may also be required for functional changes within the NMT to enable or improve operations with compatible future military satellite communications systems. Work will primarily be performed at Marlborough, Massachusetts, and is expected to be completed by December 2025. The Naval Information Warfare Systems Command, San Diego, California, is the contracting activity.