What does MMSA stand for?

Man-Machine System Analysis - Engineering

Manual Molder Shielded Arc

Master of Midwifery, Society of Apothecaries

Materials and Methods Standards Association (EA)

Medical Mycological Society of the Americas (EA)

Member, Medical Specialists' Association (CMD)

Mercantile Marine Service Association - British

Methods and Materials Standards Association (EA)

Military Medical Supply Agency - Later, Defense Medical Supply Center

Mining and Metallurgical Society of America (EA)

Mistress of Midwifery, Society of Apothecaries (SAUO)

Mitsubishi Motor Sales of America, Inc.

Multiple-Mission Support Area - Space Flight Operations Facility, NASA