Aviation Resource Management System (USAF)
Defense Intelligence Agency
General Staff Level office for Military Intelligence (Division and Above)
Acronyms are words that are usually abbreviated with the first character of each word. It is a way to convey information faster. Like the computer industry, the military is chock-full of acronyms.
Need a random acronym used by the military? Get funny, weird, and obscure military jargon with this tool.
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Source: Wikipedia.