"Roger that"
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Interesting history of where the term "Roger" came from.
https://getpocket.com/explore/item/where-roger-that-really-comes-from
In the Morse code days, when sending long messages could be arduous, a useful shorthand was to respond with single, meaningful letters.
Responding to a message with the letter “R,” for example, simply let the sender know their message had been received. When two-way radio came along, the shorthand continued, but with the word “Roger” instead of “R” itself.
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Great. Now explain why the military always fires at that poor guy, Will?