case-by-case basis. your question was leaving -- it is not regular. i don't want to leave you with the idea we're somehow patrolling the streets of kabul but on occasion where there is a need and there is a capability to meet that need our commanders on the ground are doing what they feel they need to do to help americans reach the airport and there is a variety of methods that can be affected and without going into detail we're using the variety of methods at our disposal. >> we know about the helicopter on thursday at the hotel and any other situations like that? >> at least one additional instance where rotary airlift was used to help amamericans ge from outside the airport into the airport. i think i will leave it at that