A Question About a Sentence

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Dec 1, 2010 04:19
Today, I have a question about a sentence in a book called “Echo Park”.
First, I'd like you to read conversations between two detectives.

“Okay, we’re going up. You wait here for SID and the OPG. Don’t let the tow guy touch the car until Forensics takes a look.”
“You got it.”

I don’t understand why the subject of the last sentence is “You”.
Why does he say, “I got it.”?
Does “You got it.” mean “You got my promise.” or anything else?

I’d appreciate it if you could explain it to me.

Thanks in advance.
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