Chevvron (or someone else who knows more than I), is it improper for an A/G operator to state "at your discretion"? I used to do A/G at a local airfield and occasionally we got pilots visiting who either forgot we were A/G or didn't know the difference and would ask for taxi clearance or even take off clearance. I used to just reply "at your discretion" because it seemed more appropriate than beginning a lesson over the radio as to why they shouldn't be asking. I would never say it to an aircraft who stated that he was "taking off" or "rolling", only the ones who requested it.