MABES MAgnetic Bearing flywheel Experimental System
MACS Medium Altitude Communications Satellite
MALLAR MAnned Lunar Landing And Return
MAPS Mars Ascent Propulsion System
MARCE Marshall Amateur Radio Club Experiment
MARECS MARitime European Communications Satellite
MAROTS MARitime Orbital TeSt
MARS Manned Astronomical Research Station
MARV MAnoeuvrable Re-entry Vehicles
MAS Mejplanetnaia Automaticheskaia Stansia
MASCONS MASive CONcentrationS
MASER Microwave Amplification by Stimulated Emission of Radiation
MAWD Mars Atmospheric Water Detector
MC Micrometeorite Collection
MCC Mission Control Center
MCGS Microwave Command Guidance System
MD Mass Determination
MDA Missile Defense Agency
MDC Missile Development Center
MDI Michelson Doppler Imager
MDS Malfunction Detection System
MDS Meteroid Detection System
MEA Materials Experiments Assembly
MEC Materials Experiment Carrier
MEIDEX MEdioterranean Israeli Dust Experiment
MER Mars Exploration Rovers
MET Modularized Equipment Transporter
MFA Magnetic Field Apparatus
MFSS Missile Flight Safety System
MGM Mechanics of Granular Materials
MGS Mars Global Surveyor
MHV Miniature Homing Vehicle
MIDAS Missile Integrated Defense Alarm System
MILA Merrit Island Launch Area
MILCOMSAT MILitary COMmunications SATellite
MIRV Multiple Independently Reentry Vehicles
MIT Massachusetts Institute of Technology
ML Mobile Launcher
MLD Median Lethal Dose
MLT Median Lethal Time
MMTS Manned Military Test Station
MNS Manual Navigation Sightings
MOBOT MObile roBOT
MOBS Multi-Orbit Bombing System
MODS Military Orbital Development Station
MOE Meteorology, Observation, Ecology
MOF Manned Orbital Facility
MOL Manned Orbiting Laboratory
MOMS Modular Optoelectronic Multispectral Scanner
MOS Marine Observation Satellite
MOUSE Minimum Orbital Unmanned Satellite of the Earth
MOWS Manned Orbital Weapon System
MP Mars Probe
MPP Most Probable Position
MPPF Multi-purpose Payload Processing Facility
MPS Material Processing in Space
MRBM Medium Range Ballistic Missile
MRN Meteorological Rocket Network
MRV Multi-Reentry Vehicles
MRWS Manned Remote Work Station
MSC Manned Spacecraft Center
MSFC Marshall Space Flight Center
MSFN Manned Space Flight Network
MSI Multi-Spectral Imagery
MSL Meteorological Satellite Laboratory
MSR Missile Site Radar
MSRM Mars Sample Return Mission
MSS Multi-Spectral Scanner
MSSL Mullard Space Science Laboratory
MSTRS Miniature Satellite Threat Reporting System
MSU Microwave Sounding Unit
MSX Midcourse Space eXperiment
MTC Missile Test Center
MTC Mission Test Computer
MTD Missile Technology Demonstration
MTF Mississippi Test Facility
MTSS Military Test Space Station
MTVS Mission Test Video System
MVM Mariner-Venus-Mercury
MWT Minium Weight Tracking
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