Presidents have given formal condolences and tribute to BOTH active and retired veterans-- they clearly didn't care of the nature of their death-- that only means something to you, and only you.
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You're actually asking if Kyle was more "accomplished" than the vast majority of veterans who have died-- which is, of course, asinine.  He is racked and stacked with other heads of state that Obama did and did not go to-- the Washington Post wouldn't do that unless he was. Perhaps if you had served, it would make a little more sense to you-- it clearly does to President Trump, and he hasn't.