Do You Have Any Specialized Skills or Training, Including Firearms, Explosives, Nuclear, Biological, or Chemical Experience? If Yes, please explain. 我的专业是物理化学（博士）, 应该选Yes吗？选了是不是就一定得背景检查阿? 怎么Explain阿？ 还有第17条：List All Educational Institutions You Attend or Have Attended. Include Vocational Institutions But Not Elementary Schools. 背景检查是要和所有你所填写的学校证实吗？还有如果在日本签背景检查是不是时间会更长阿？谢谢！