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What does UMBRA stand for?

What does UMBRA mean? We have 2 definitions. Read most used UMBRA meanings below.

Category: All acronyms (4)Government & Military (2)Organizations, Education Schools etc. (1)

• UMBRA — [not an acronym] US Codeword for high grade SIGINT
• UMBRA — US Codeword for high grade SIGINT

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• Upper mississippi river basin association
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