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Subsystem Operation in Spacelab
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Space Shuttle Orbiter
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Safety Signification Operation
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Source Selection Official
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Support System for OEX
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System Security Officer
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Similar to SSO
2GRLV - 2nd Generation Return to Launch Vehicle
2IC - Second In Command
2M - Micro Miniature
2MASS - Two Micron All-Sky Survey
2STO - Two Stage To Orbit
3-DOF - Three Degree Of Freedom
3AAL - Three Axis Acoustic Levitator
View all in NASA