Military Sealift Command Mobile Switching Center Manned Spacecraft Center Major Subordinate Command Maritime Safety Committee Major Subordinate Commands Mobile Switching Centre Meteorological Satellite Center Meteorological Service of Canada Mobile Servicing Center Message Sequence Chart Multiple Systems Coupling Master of Science Mathematics Subject Classification Medical Service Corps Macro Selection Compiler Manpower Services Commission Maritime Sector Commander Mass Storage Class Master Sequence Controller Materials Service Center Message Switching Center Microgravity Smoldering Combustion Mine Sweeper, Coastal Mission Systems Contract Moding Sequencing and Control most significant character Multimedia Super Corridor Main Switching Centre Major Subordinate Commander
Military Sealift Command
Meteorological Satellite Center