Raytheon Co (RTN.N) has won a contract worth up to $2.35 billion to build 52 SM-3 Block IB missiles for the U.S. Missile Defense Agency using fiscal 2015 funding, plus three one-year options, the Pentagon said on Friday. The contract finalizes a preliminary contract for 44 SM-3 Block IB missiles awarded to Raytheon in April with a value of $541 million and adds eight missiles for a total of 52, the Defense Department said in its daily digest of arms contracts. The U.S. and Romanian governments on Friday said work had been completed on a new U.S.