The Navy plans to finish risk mitigation efforts for F-18 aircrew who may be exposed to impure air due to glitches in the aircraft's onboard oxygen generation system by the end of calendar year 2017, according to a spokesman. The mitigation efforts include refining aircrew procedures to maximize OBOGS system capability and to minimize risk exposure, improving maintenance practices and procedures for better system reliability and having handheld monitors at every operating site to quickly diagnose aircrew exposure to carbon...