Switched Multimegabit Data Service
Switched Multimegabit Digital Service
Switched Multimegabit Data Services
Switched Megabit Data Service
Switched Multimedia Data Service
Switched Multimegabit Data System
Satellite Multimedia Delivery System
secondary myelodysplasia
secondary myelodysplastic syndrome
Shell Middle Distillate Synthesis
Shell Middle Distillation Synthesis
Shipboard Multiplex Distribution Syste…
Standard Microcircuit Drawings
standardized mean differences
Standoff Minefield Detection System
sudden manhood death syndrome
switch multimegabit data service
Switched Multi-Megabit Data Service
Switched Multimegabit Date Service
Systems Management and Display Subsyst…