OSHKOSH, Wisconsin (Reuters) -The new head of the Federal Aviation Administration said on Thursday the current state of the aging, understaffed U.S. air traffic control system is "not acceptable," vowing an aggressive modernization effort. New FAA Administrator Bryan Bedford also said morale at the agency is "kind of low" after a fatal crash in January near Reagan Washington National Airport killed 67. The issues plaguing the FAA's air traffic control network have been years in the making, but a rush of high-profile mishaps, near-misses and the catastrophic crash in January between a U.S. Army helicopter and a regional American Airlines spiked public alarm.