Tucson-based Raytheon Missile Systems has been awarded a $126 million contract to procure material needed to manufacture up to 29 Standard Missile-3 Block IB missile interceptors, the Pentagon said today.

The modification to a standing contract from the U.S. Missile Defense Agency raises the overall value of the work to nearly $180 million, according to a Defense Department contract notice. The work, funded by defense-wide fiscal 2013 procurement funds, is expected to be completed in September 2016.

Scheduled for initial deployment by 2015, the SM-3 IB is the latest version of the interceptor used with the ship-based Aegis Ballistic Missile Defense system, a key part of the Obama administration phased plan for a missile shield around Europe. The current, SM-3 Block IA missile interceptor is deployed aboard several Aegis-equipped U.S. warships.

The Pentagon’s 2014 budget seeks funding for 52 SM-3 Block IB missiles.