(a) methyl ethyl ketone (p) Mujahideen al-Khalq MEL (i) Maya Embedded Language Michigan Electronic Library MELT – (a) Metallic Line/Loop Test (ing) MEM (i) Message Exchange Mechanism (p) Microelectromechanical MEMS – (p) Microelectromechanical System MENA – (i/a) Middle East and North Africa ("MEE-na" or "MEH-na") MEO (a) Medium earth orbit Most efficient organization MEP (i) Mechanical Electrical Plumbing Member of the European Parliament Missions étrangères de Paris (French for "Paris Foreign Missions") Model European Parliament MER – (i) Mars Exploration Rover MERL – (i) Mitsubishi Electric Research Laboratories MES (i) Marconi Electronic Systems Medium Edison screw MESSENGER – (p) MErcury Surface, Space ENvironment, GEochemistry and Ranging MET (p) Meteorological (a) Middle European Time METAR – (p) [Meteorological] Aviation Routine weather report METL – (i/a) Mission Essential Task List ("mettle") METOC – (p) Meteorological and Oceanographic METT-T – (a/i) Mission, Enemy, Terrain, Troops, and Time available (mnemonic) METT-TC – (a/i) Mission, Enemy, Terrain [and weather], Troops [and support], Time [available] and Civilian considerations (mnemonic) MEU (i) U.S. Marine Expeditionary Unit Maximum Expected Utility MeV – (s) Megaelectronvolt MEV (i) Medical Evacuation Vehicle Musica Elettronica Viva MEX – (s) Mexico (ISO 3166 trigram) MEZ – (i) Missile Engagement Zone MES – (a) Manufacturing Execution Systems MF mF – (s) Millifarad MF (s) Mayotte (FIPS 10-4 territory code) Megafarad MFSB – (i) Mother, Father, Sister, Brother (1970s Philadelphia studio musicians collective) MFT (i) Managed file transfer Master File Table Mean field theory Media Foundation Transform Micro Four Thirds (camera design standard) MG mg – (s) Malagasy language (ISO 639-1 code) – Milligram Mg – (s) Magnesium – Megagram MG – (i) Machine Gun – (s) Madagascar (ISO 3166 digram) – (s) Major General – (s) Mongolia (FIPS 10-4 country code) – (i) Morris Garage MGA – (s) Malagasy ariary (ISO 4217 currency code) MGB – (i) Medium Girder Bridge, Motor Gun Boat MGM – (i) Metro Goldwyn Mayer – (s) Montgomery, Alabama (Airport Code) MGPAM – My Gym Partner's a Monkey MGS – (i) Mobile Gun System MH mh – (s) Marshallese language (ISO 639-1 code) mH – (s) Millihenry MH – (s) Marshall Islands (postal symbol; ISO 3166 digram) – Megahenry – Montserrat (FIPS 10-4 territory code) MHC – (i) Major Histocompatibility Complex MHHW – (i) Mean Higher High Water (nautical charts) MHL – (s) Marshall Islands (ISO 3166 trigram) MHLW – (i) Mean Higher Low Water (nautical charts) MHRA – (i)