I'm looking for a less formal synonym for "Confirmed" or "Ackowledged", that retains some brevity. As an example, say I've received an e-mail from my manager asking me to switch to a different task. The request is clear, and I'd like to acknowledge that I've read and understood it, but I don't need even that much vebosity. I could reply with just "Roger" but that just seems almost too informal:
"We've got clearance, Clarence."
"What's our vector, Victor?"