Other Uses
- Middle school, in Canada and the USA, a school providing intermediate education
- Missionaries of La Salette, a Catholic male religious order
- Morgan Stanley, a US investment bank with NYSE stock ticker symbol MS, and the domain MS.com
- Mara Salvatrucha, large criminal gangs in Central America and the U.S.
In the military:
- Master Seaman, a non-commissioned member rank of the Canadian Navy
- Mess Management Specialist, a U.S. Navy occupational rating superseded by the term Culinary Specialist
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