I and ten codes have a hate hate relationship. They serve no use for brevity (most of them are longer than the pro-words that can be used instead) and serve no use for COMSEC since everybody knows them and publishes them online. Not to mention that nearly every single agency that likes to call itself important has a different set, making interop a major PITA. Anyway, not to hijack the thread.
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OC / UMBC