Aye aye, sir

"Aye aye, sir" is a phrase commonly heard in present-day naval language. It is derived from a duplicate of the word "aye", which came into the English language in the late 16th century and early 17th century, meaning "Yes; even so."
Description
"Aye" was common in dialect and is the formal word for voting "yes" in the United Kingdom House of Commons.
The most common use of "Aye aye, sir" is as a naval response indicating that an order has been received, is understood, and will be carried out immediately. It differs from "yes", which, in standard usage, could mean simple agreement without any intention to act. In naval custom, a reply of "yes sir" would indicate agreement to a statement that was not understood as an order or a requirement to do anything. The alternatives of "aye aye sir" and "yes sir" would allow any misunderstanding to be corrected at once. This might be a matter of life and death for a ship at sea.
Basically, it means that the speaker understands and will obey a direct order.
Aye = Yes, that is correct.
Aye Aye = I understand, and will comply.
Controversy surrounds "Aye aye" for its repetition. While the "Customs and Courtesies" of the United States Marine Corps (USMC) defines "Aye aye" as mentioned above, US naval officers disagree. US Seaman (and Seaman Recruits) are trained to simply say "Aye sir" regardless of context, (i.e.):
1) USN: "Make your depth 50 meters."
Response: "Five-zero meters, aye, sir"
2) USMC: "Have you field-stripped your rifle today?"
Response: "Yes, sir"
3). "Go grab the Gunny."
Response: "Grab the Gunny, aye, sir."
Per the examples above, "Yes sir" would also be correct in any case, but is substituted per the Naval tradition. Repetition of the acknowledgement would translate to "Yes, Yes sir"
In other words, a simple 'Aye,' may be the naval equivalent to the aeronautical difference between "Roger" and "Wilco." However, Merriam-Webster (US) and the Oxford English Dictionary (UK) are not in agreement on the denotation as it is used in common naval practice.
Variation: "Roger, Aye." This is a combination of the radio procedure code Roger and the naval affirmative "Aye, sir." While it is non-standard in radio procedure and in naval parlance, it is commonly used in maritime radio communications.

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