Shore patrol

[1] They are often temporarily assigned personnel who receive limited training in law enforcement and are commonly armed with a baton.

[2] Their primary function is to make certain that sailors, marines, and coast guardsmen on liberty do not become too rowdy.

They will also provide assistance for Department of the Navy and U.S. Coast Guard uniformed personnel in relations with the civilian courts and police.

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A U.S. Marine corporal cuffs an unauthorized absentee serviceman as a U.S. Navy master-at-arms looks on; note "SP" armband on each.
Shore patrol speaks with sailors in Crete, 2003