The roar of an F-16 fighter jet regularly interrupts the daily grind in central Hualien.  Located on Taiwan’s mountainous eastern coast, Hualien is best known as a launching pad for avid hikers visiting the jaw-dropping cliffs of nearby Taroko National Park. But it is also home to the Chiashan Air Force Base — one of Taiwan’s most important defense installations in the event of a Chinese military invasion.  The regular sorties of the iconic American-made military aircraft s