Only you know your boyfriend and his tastes. It has become quite fashionable for men to wear dog tags in civilian life. Dog tags symbolize virility and strength of character. Giving them to your boyfriend would show how much you respect and appreciate him. You can find many styles on the Internet, or you can go to your local jewelry store to see the selection they may have. You can customize the dog tags for his individual taste or have information about the two of you such as your names, birth dates, day you met, your first year anniversary and so on. You might even consider getting a matching set to show the world the love you have for each other.