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CMV: America decided to vilify the concept of military parades because its own roads are too shitty to move armored vehicles
(hexbear.net)
I bet the Pentagon had a big bash planned and everything when their engineering corps brought them the bad news. Then they had to spin the sour grapes.
Source: Vibes 
Americans also don't have any military victories to celebrate. Both in the sense that the keep loosing wars, and in the sense that even when they win wars, they end up creating such hellish outcomes that the ruling class prefers to bury the shit under the sand.
Fair enough. That is a victory worth celebrating because the 9/11 planner (aka comrade George "Dubya" Bush) was successful in accelerating American decline by 20 years.