Mich. Comp. Laws § 388.421
Any teacher who has left or leaves a teaching position, other than a temporary teaching position, in any school district in Michigan in order to serve in any branch of the armed services of the United States and who upon termination of such services (1) receives an honorable discharge from the armed forces; (2) is still qualified and competent to perform the duties of such teaching position; and (3) makes application to said school district for reemployment within 90 days after he is relieved from such military service shall be restored at the beginning of the semester or term following the application to such teaching position or to a position of like nature, seniority, status, and pay unless circumstances have so changed as to make it impossible or unreasonable to do so.
MCL 388.421