The Navy is investigating what caused an MQ-8B Fire Scout unmanned helicopter to unexpectedly suffer a “hard landing” during a recent test flight in Maryland, according to documents and officials. The Naval Safety Center has categorized the Oct. 24 event -- a hard landing from a hover after takeoff during a test flight -- as a “class A” mishap, signaling the initial estimate for the damage's cost is at least $2 million. Navy spokesman Doug Abbotts said officials are still...