The TOW -- tube-launched, optically tracked, wire-guided missile -- is an anti-armor system with a range of more than 3,000 yards. It can be fired from vehicles and helicopters as well as by infantry.
The original version was introduced into service in 1970.
Under the five-year award, Raytheon Technical Services Company LLC will provide field engineering support, technical engineering and configuration management for the Army's Close Combat Systems, including Bradley Fighting Vehicles.
"The customer's selection of Technical Services as a prime contractor affirms our strong capabilities in providing engineering services and innovative, cost-effective customer solutions," said RTSC President John Harris.
"Together, RTSC and Raytheon Missile Systems' engineering and logistics solutions will support systems from Huntsville to Afghanistan and offer assurance to our warfighters that they have systems that perform anytime and everywhere."
Raytheon said it has performed work on the TOW for the Army since the 1990s.