Lockheed Martin Mission Systems and Training of Moorestown, N.J., beat out two competitors to hold on to a contract worth as much as $100 million to continue providing combat system engineering services for the Navy’s ballistic missile defense system.

Lockheed will develop and maintain the Aegis weapon system and Aegis combat system for Navy cruisers and destroyers, according to a March 4 announcement from the U.S. Defense Department.

Aegis is used to detect and intercept missile threats to Navy surface ships. The Navy received three bids for the contract, according to a release. Boeing Defense, Space & Security of St. Louis, and Raytheon Integrated Defense Systems of Tewksbury, Mass., were the other bidders, representatives from those companies said.

“While this decision is a disappointment, we remain committed to supporting the U.S. Navy’s ballistic missile defense mission, including integration of our concept development and design contract phase of the SM-3 2B missile,” Scott Day, a Boeing spokesman wrote in an emailed statement.

Lockheed received $2.9 million at the time of the announcement.

“By openly competing the Aegis CSEA contract, the Navy will benefit from improved systems at a lower cost, which is absolutely critical in light of our budget challenges,” Rear Adm. Joe Horn, program executive officer for Integrated Weapons Systems, said in a statement.

The contract is expected to be completed by May 2018.