Short Message Service 
Systems Management Server 
Short Messaging Service 
Safety Management Systems 
Service Management System 
Storage Management Services 
Shuttle Mission Simulator 
Stores Management System 
Safety Management System 
Service Management Solution 
Space Motion Sickness 
Storage Management Subsystem 
Single Mobility System 
Synchronous Meteorological Satellite 
System Managed Storage 
Scalable Modeling System 
Short Message Services 
Solar Mass Sensor 
System Management Server 
SALMSON 
Sample Manipulation System 
Satellite Multi Service 
Satellite Multi-Service System 
Security Management System 
Sega Master System 
Separation Mechanism Subsystem 
Solar Maximum Satellite 
Strategic Missile Squadron 
Structures and Mechanisms Subsystem 
Subscriber Management System