Mars Climate Orbiter 
Managed Care Organization 
Movement Control Officer 
Major Combat Operations 
MARINE CORPS ORDER 
Manual change order 
Mars Climate Observer 
Medical College of Ohio 
Mission Control Operations 
Modern Chess Openings 
MONACO 
Aerolineas Marcos 
IATA code for Orlando International Ai… 
Maintenance and Construction Operation… 
Maintenance Capable Office 
Maintenance Carry Over 
Maintenance Control Office 
Maintenance Control Officer 
Maintenance Coordinator 
Major Contingency Option 
Managed Care Operation 
Managed Care Organisation 
Managed Care Organizations 
Management Control Officer 
Maneuver Control Officer 
Manufacturer's Certificate of Origin 
Mapping and Communications Orbiter 
MASINT Control Officer 
Maximum Concentration of Organics 
metal-catalyzed oxidation