Approval of this form is required in advance of travel, except in extraordinary circumstances. Submit the Form 28 along with the relevant documents.Read the complete article to get a clear view of the noc application format. NOC Request Letter Format Samples. Here are some samples to help you understand how an application for an NOC is written. A simple NOC contains the following elements: Date of writing the letter. Address of the Visa Application Center. Per the District of Massachusetts Travel Policy, 14 days notice is required for all travel requests. Appropriation Number: Insert the appropriation number against which travel purchases are to be encumbered and expended. 6. A no objection letter is a document that states that a person is permitted to travel to the United States.