Some of the largest defense contractors on Thursday reported increased profit in their most recent quarter. Raytheon said Thursday sales in the company’s most recent quarter hit $6 billion, up 4 percent from the same three-month period a year earlier. The company’s profit rose to $524 million, up 18 percent from the prior year. Raytheon’s missile systems and space and airborne systems businesses both saw significant sales boosts. The missile systems unit, which saw revenue increase about 9 percent, reported...