want to bring back and if i can get mark polymeropoulos, general staff to the as well into the conversation. and if the loosest ill and, now we want to talk to him as well. mark, i know you said you use these things before, these balloons. if you can describe for folks that is, like i asked general in the last hour as well, how is that you choose something like this down but also in the same breath kind of maintain the integrity of it so that the united states can gather intelligence from it right? could i understand what the chinese are trying to do? >> well first of all you know the surveillance platforms that we use for example in afghanistan are much lower altitude. they were tethered to the, ground they provided tremendous situational awareness. at, sometimes that have some kind of advance of violence packages on there where we can see you know the area around the city the enemy. it was incredibly useful. going back to what the first part of your question, i do think there is some merit and you know, despite all of the criticism really on twitter, that the balloon was traversing across