Modular Auxiliary Data System 
Machine-Aided Drafting System 
Maintenance And Diagnosis System 
Modified Air Defense System 
Modular Auxiliary Data Systems 
Multiple Access Data System 
Main Aircraft Data System 
Mandibular advancement devices 
Maritime Air Delivery System 
Mass Adjusted System 
MCM1-agamous-deficiens-serum response… 
Medicare Actuarial Data System 
Microsoft Active Directory Service 
Militarized Advanced Disk System 
Missile Approach Detector Systems 
Missile Attitude Determination System 
Mission Area Deficiency Statement 
Modeling and Analysis Data Set 
Modified Air Defence System 
Modular Auiliary Data System 
Modular Auxiliary Data Subsystems 
Multiple Area Data Sets