Military slang meaning: "I've received and understood your message in it's entirely".
Contrasts with "No Copy", a phrase used when a message was partially or fully lost. Originally came as a response to the phrase "
How Copy?", a term a
transmitter asks a recipient to find out if their message has been properly
relayed. It has since slipped into the military colloquial.
1Lt Martin: "
I need you present at 1615 tomorrow to discuss our new operations orders."
1Lt
Daniels: "
Good copy."