The option is worth $138.7 million and brings the total value of the 2009 contract to $803 million.
"This award represents the U.S. Army's continued commitment to the Patriot Air and Missile Defense System deployed by the U.S. and 11 international partners," said Sanjay Kapoor, vice president of Integrated Air and Missile Defense at Raytheon's Integrated Defense Systems business.
"Ongoing sustainment through engineering services ensures that the Patriot systems are at the highest level of readiness."
Under the contract from the U.S. Army Aviation and Missile Command, Redstone Arsenal, Ala., Raytheon to continue to deliver systems analysis, software and hardware engineering, testing and logistics support for the program.
Work by Raytheon will be performed in Massachusetts, Alabama and New Mexico.