Proper noun
USMS
Initialism of United States Marshals Service.
In accordance with 46 U.S. Code § 51701, the USMS rank structure must be the same as that of the U.S. Coast Guard while uniforms worn are those of the U.S. Navy with distinctive USMS insignia and devices. Source: Internet
The USMS has appointed warrant officers, of various specialty fields, during and after World War II. 46 U.S. Code § 51701 (c) Ranks, Grades, and Ratings. Source: Internet