One of the mysteries of the English language finally explained.
A senior military officer concerned with discipline and the arrest, custody, or punishment of offenders. Now chiefly US: the head of the military police and the criminal investigation department of the army.
Mid 17th century. From provost marshal + general.
provost marshal general/prəˌvəʊ ˌmɑːʃl ˈdʒɛn(ə)rəl/
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