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About MASO Who are we. Maryland Association of Softball Officials MASO provides fastpitch softball umpire services to Central Marylandarea public schools MPSSAA private schools as part of theMaryland Interscholastic Athletic Association IAAM and National Club Softball Association NCSA. What does being an umpire mean. Being an umpire is much more than understanding pitching hitting catching and baserunning It is being responsible for enforcing onfield rules and rendering decisions on judgment calls.