We hear a lot about years-long weapons purchases that end up costing the Defense Department millions more than anticipated. But the Navy, with a new acquisition honor, is highlighting a program that managed to do the opposite. The Maritime Patrol and Reconnaissance Aircraft Program Office recently saved 5 percent off the cost of anti-submarine aircrafts known as P8’s. Martin Ahmad, the office’s principal deputy program manager, says the award comes at the end of a long road.