You volunteered to serve your country.

你们自告奋勇服务国家。

Serving your country is a very big deal and I don't ever want to take that lightly.

参军报国并非小可，我也会严肃的对待的。

To collect documents is one mode of serving your country, and to remember the contents of a document is another.

收集文件是为国家服务的一种方式， 记住文件的内容是另一种方式。

One of the letters said this: You have served your country well by your willingness to do a dangerous and important job with a rare ability.

" 你愿意用一种罕见的能力来做一份危而重要的工作，你很好地服务了这个国家。

Others are headed to graduate school; some will go off to serve your country, or community; some to a well-deserved rest just to take in the lay of the land before setting off on new adventures.

有些人进入了研究生院；有些人会离开，去为自己的国家或社区服务；有些人会好好地休息一番，只是为了在开始新的冒险之前了解一下环境。