and what i basically, from the transcom standpoint we need 30 2.7 million ton miles. and as the air force looks at what's the best of those airplanes, that's where the c-17, c-5 mix came up. from my standpoint, one of the things that i'm very excited about is as we get the new tanker and right now we use c-17 in ways i would rather be using the new multi-rule tanker and that will freedom up to do some of the of the work. i think that's going to a positive all by itself is one of those things that folks don't realize the impact we have on to using c-17 is to translate from our reserve air fleet, both cargo and packs because they can't take them all the way forward. when i think about the future, and you make a very good point, one, i think they are planning to make sure they keep to them. i think dick issued a history of the of the portion i think we would say as you mention, as look at the new study, what are the other things we need to do, and again, how will that mix and match. when i first was working as a major on the c-17 and talking about when we need at that po