Raytheon Missile Systems of Tucson, Ariz., has been awarded a $62 million contract modification from the U.S. Missile Defense Agency for work on a new missile interceptor, the Defense Department announced March 5.

The change allows Raytheon to perform engineering support for the Standard Missile (SM)-3 Block 1B and increases the contract value from $594 million to $656 million.

The SM3-Block1B is deployed on U.S. Navy ships as part of the MDA’s Aegis Ballistic Missile Defense system. The Block 1B has a longer range than its predecessor, the Block 1A interceptors, and a different divert and attitude control system.

Work is expected to be completed by Sept. 30, 2015.