恕我冒眜.
"必须要证明如果办理LC会延误时间,从而损害美国的国家利益" 这么说不妥. 如果将来LC处理时间变短了,这个理由就站不住脚了.So the officer will not buy this excuse.
To use long-standing reasons to convince the immigration officer, you need to understand what are the purpose of LC and the purpose of NIW, then you can understand what reasons can properly used.
To rpove the 3rd prong of NIW is not an easy task, you need to provide comprehensive evidence to demonstrate that the national interest would be adversely affected if you were asked to going through LC. Chek out my following old post to read it carefully, you will know how to do it.
http://web.wenxuecity.com/BBSView.php?SubID=immigration&MsgID=130071
The applicant got this strang RFE, most likely due to the poorly prepared petition letter. Just to copy and paste can not make a good petition letter. The applicant must go over the petition letter written by your lawyer before they for you since lawyer may not understand thoroughly about the research statment written by you.
Just my personal opinion. Good luck.
yjy_wang@yahoo.com