Raytheon has received a $458.9 million contract to modernize various cryptographic equipment for the U.S. Air Force.

The contract includes modernization services for existing VINSON and Advanced Narrowband Digital Voice Terminal capabilities used by the National Security Agency, and involves foreign military sales. The U.S. Department of Defense did not yet disclose which countries may be included in the contract.

Work is scheduled to be performed at Fort Wayne, Ind., and Largo, Fla., and is expected to be completed by Dec. 15, 2021. $75 million in procurement funds were provided at the time of the contract award. The Air Force Life Cycle Management Center in Lackland Texas is listed as the contracting activity.

Advanced Narrowband Digital Voice Terminal, or ANDVT, is a device used to provide low-bandwidth communications for the Defense Department, the National Security Agency, and other allied forces. Raytheon's contract award supports the Cryptographic Modernization program, which aims to enhance encryption performance.