The Defense Department will double its contribution to the Federal Aviation Administration's air-surveillance network, a move that reflects the pivotal role the system now plays in national security, according to a senior Pentagon official. Beginning Oct. 1, DOD will boost its contribution for the upkeep of FAA's network of long-range radars -- many of which are decades old -- from 25 percent to 50 percent. The Department of Homeland Security will pay the balance. "We call them FAA radars, but...