Using an anti-terrorism department letterhead template can provide several benefits. First, it can help to create a sense of professionalism and legitimacy. When correspondents receive a letter on official letterhead, they are more likely to take the contents of the letter seriously. Second, using a letterhead template can help to save time and effort. By using a pre-designed template, departments can simply fill in the necessary information without having to spend time creating a new letterhead each time they need to send a letter.