The U.S. Missile Defense Agency (MDA) awarded Raytheon Missile Systems of Tucson, Ariz., a $230 million contract modification for 19 additional Standard Missile 3 (SM-3) ship-based interceptors, the Pentagon announced Aug. 30.

The sole-source, cost-plus-incentive-fee contract modification calls for 14 SM-3 Block 1A interceptors and five of the new Block 1B variants and increases the value of Raytheon’s contract to $1.9 billion, the Pentagon said.

The SM-3 Block 1A variant is designed to counter short- and medium-range missiles. It 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 the Block 1A interceptors and a different divert and attitude control system.

The MDA also awarded Aug. 30 a potential $8.3 million contract modification to Moorestown, N.J.-based Lockheed Martin Missions Systems and Sensors to perform work at the Pacific Missile Range Facility in Hawaii in support of Aegis Ashore, the land-based version of the Aegis Ballistic Missile Defense system.