As described in the Constitution of Denmark, § 81, Denmark has mandatory service for all able men. Normal service is four months, and is normally served by men in the age of eighteen to twenty-seven. Some special services will take longer. Danish men will typically receive a letter around the time of their 18th birthday, asking when their current education (if any) ends, and some time later, depending on when, they will receive a notice on when to attend to the draft office to be tested physically and psychologically. However, some may be deemed unfit for service and not be required to show up.