You can apply for a Missouri professional license on the strength of a valid license you already hold from another state, a territory or a branch of the U.S. Armed Forces. You have to have been licensed for at least one year in the other jurisdiction, and the Missouri license will be in the same profession at the same practice level.
Apply to the Missouri licensing board for your profession and include proof of your out-of-state or military license and how long you have held it.
Your current license from the other state, territory or armed forces branch, documentation that you have held it for at least one year, and your military service documentation.