    ‘Sentence I: What 3 thifigs dées the Air Foreé work key nv    Sentence: 2: Baran. developed the. concept. of distributed  adaptive inessage block switching during his research-at the  RAND .Corporatioi: for. the US Air Force into: survivable  - cominunications networks, first presented to the Air Force in  the ‘summer of 1961'as briefing B-265.:later published-as    ‘RAND report P-2626 in 1962, and:®tnally in: report RM 3420 in’  1964, *    a