Interpreters and translators facilitate the cross-cultural communication necessary in today's society by converting one language into another. However, in order to be effective they need not just simply translate words but thoroughly understand the subject matter in which they work in order to accurately convey information.
Log on to http://www.youngbuzz.com/careers/careerdetail/linguist-career to read more about the career, its scope, career map, remuneration, benefits etc,
While you say that you want to get into government agencies you certainly can do that gradually with substantial experience. But remember services of interpreters and translators are needed in a number of subject areas. While these workers may not completely specialize in a particular field or industry, many do focus on one area of expertise. Some of the most common areas are described below; however, interpreters and translators may work in a variety of other areas also, including business, education, social services, and entertainment. So dont restrict yourself!
Other areas that you can consider are:
*Judiciary interpreters and translators
*Medical interpreters and translator
*Guide or escort interpreters
As you can see, there are varied career options available for you to experiment before you narrow down.
Hope this helps.