Class Abbreviations and Acronyms
- MEOMarine Engineering Officer
- MFMilano Finanza
- MHCMajor Histocompatibility Complexes
- MHCMajor Histocompatability Complex
- MHCMajor Histocompatiblity Complex
- MHCMine-Hunter, Coastal
- MHCMine Hunter, Coastal
- MHCSMajor Histocompatibility Complexes
- MHSMarion High School
- MHSMarlboro High School
- MHSMarlbmro High School
- MHSMedford High School
- MIDASMine and Ice Detection Avoidance System
- MJModern Jive
- MKMorgan-Keenan
- MKMorgan Keevan
- MKDMinimum Keyboard & Display
- MKDMinimum Keyboard Display
- MMUMultiple Metqr Unit
- MNMerchant Navy
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