Working for USA Government as Translator, Permissible!
A Muslim is required to fear Allah and not to set a bad example in his or her community. A Muslim is supposed to be positive, cooperative, and beneficial to the society he or she lives in.
Answering this question, Dr. Monzer Kahf, scholar in Islamic economics & a financial expert, said,
Yes, this is permissible. Of course, the work should be done with full honesty. A translator is not an informant. It is wrong to be informant to any government because that implies spying on someone that is demeaning.
May Allah guide all to what pleases Him