Mobile Subscriber Equipment 
Maintenance Support Equipment 
mean square error 
Mechanical Support Equipment 
medical support equipment 
Missile Segment Enhancement 
micro and small enterprises 
Midwest Stock Exchange 
Mission Staff Engineer 
mission support element 
Mississippi Export Railroad 
Major Subordinate Element 
Manila Stock Exchange 
Mean Squared Error 
Measuring and Stimuli Equipment 
Milwaukee School of Engineering 
Mission Services Engineering 
Mission Support Equipment 
Mission Systems Engineer 
Mobile Station Equipment 
Multiple Sample Exchanger 
multiple subscriber equipment 
Macedonian Stock Exchange 
Macromolecular Science and Engineering 
Main Staff Element 
Maintenance Sub-Entity 
manifest spherical equivalent 
Manned Spaceflight Engineer 
Manufacturing Systems Engineering 
Master of Sanitary Engineering