A thank-you letter to a veteran should begin by addressing the person by name or rank, and should maintain a sincere and upbeat tone throughout the letter. The letter should not mention politics, war or religion, which are sensitive subjects that can lead to conflict.
Along with expressing gratitude, the letter should tell the veteran a bit about the writer if they were previously unknown to each other. A letter from someone the veterans knows should bring the veteran up to date on news in the writer's life. The letter should be closed by including the writer's postal address or email address so that the veteran can write back if they wish to do so.