Medicare Administrative Contractors 
Marine Air Control Squadron 
Message Authentication Codes 
Military Aeronautical Communications S… 
Modular Artillery Charge System 
Modular Attitude Control Subsystem 
Modular Attitude Control System 
magnetic cell sorting system 
manipulation and beam collimation syst… 
Marshall Access Control System 
Maximum Allowable Concentrations 
Media Access Controllers 
Mission Accounting and Control System 
Mission Assurance Categories 
Mobile Air Conditioning Society 
modified atomic charge superposition 
Moves, Adds and Charges 
Multiple Awards Contracts 
macrophages 
Magnetic Activated Cell Sorter 
magnetic activated cell sorting 
Magnetic affinity cell sorting 
magnetic cell separation 
magnetic cell separator 
magnetic cell sorter 
magnetic cell sorting 
magnetic-activated cell separation 
Mail order And Catalog System 
Maintenance Allocation Charts 
malignancy-associated changes