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Office of Space Science
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OEX Support System
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Office of Space Station
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Operational Support System
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Optics Sub-System
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Orbiting Space Station
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Similar to OSS
ABS - Air Base Supply
ABT - Approximate Burn Time
ABU - Analog Back- Up
ABU - After Body Unit
ABUP - Auxiliary Back- Up Plate
ABV - Above
ABV - Air Bubble Vehicle
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