What does GMMSN mean in NAVY

GMMSN stands for Gunner's Mate (Mounts) Seaman. It is a U.S. Navy rating that focuses on maintaining and operating naval weapons systems like guns, weapons components, etc.

A Gunner's Mate is responsible for assembling, mounting, dismounting, maintaining and repairing naval ordnance such as guns and related components. They are also responsible for the safe storage of ammunition and firearms and ensuring they are in working condition at all times.

The GMMSN rating was established in 1875 by the U.S. Navy to focus on maintaining and operating the Navy's weapons systems. It is one of the oldest ratings in the U.S. Navy and remains an important position today.

To become a GMMSN you must be a citizen of the United States with either an Active Duty or Reserve enlistment in the U.S Navy. You also must pass all physical fitness tests required by your chain of command as well as meet age requirements set by Federal law.

The navy provides extensive training for this specific rate once assigned upon completion of basic military training. Additional education such as college level courses may be taken from any accredited Maritime institution which can help increase chances if applying for promotions or commissioning programs depending on eligibility.