You can choose from 24 distinctive Montana license plate designs honoring service members, veterans, retired service members and certain family members. Each plate has its own eligibility and documentation requirements, set out in Montana Code Annotated 61-3-458.
Buy the plate at a Montana county treasurer office and bring the proof of eligibility that plate requires.
The proof the specific plate requires, usually your DD214, a VA Benefit Summary Letter, medal documentation, or a letter of eligibility from the Montana Veterans Affairs Division.