Service Module Session Management System Manager Subnet Manager Standard Missile Surface Mounted Switching Module System Management Systems Management Set Mode Shuttle Management Single Mode statute mile Surface Mount San Marino secondary mirror Service Management service mark servicing mission Sparse Mode standard model Switching Modual Science Mission Section Manager Security Management Security Module shared memory Short Message short module simple mastectomy soft manual Software Management Soldiers Manual space medicine Spectrum Management Speech Memory St. Mary's Railroad stable member Standby Monitor Statute Miles