Service Readiness Level
System Requirements Review
Space Situational Awarness
Small Satellites Earth Observation
Secondary Surface Mirrors
Space Surveillance and Tracking
Single-Stage-To-Orbit
Space Transportation
Structural Thermal Model
STRucture subsystem
Sun Simulator
System Verification and Test
SoftWare
Thermal Balance (Test)
Thermal Cycling (Test)
Thermal Control Subsystem
Technology Domain
Technology Development Activity
Technology Development Element (replacing TRP)
Tender Evaluation Board