This is especially useful if you are in a government job. Such a letter should be on the official letterhead of the employer and signed.No Objection Letter for Visa Application. The No Objection Certificate from Employer is one of the most important documents when applying for a B-1 visa. Even though this is not a required document, NOC is the official authorization letter that proves this which you have to get from your employer. What all information should be included in a NOC? Learn how these documents support your travel plans. The no objection letter or NOC is a letter from your employer school or university that states that you have certain long-term commitments and obligations. No objection letters are essential when working on a visa application here's everything you need to know about how to write them.