the XB-52 and YB-52, the prototype B-52s, were scrapped after First Lady Lady Bird Johnson’s ‘beautification’ of the US Air Force Museum

the source of that tidbit about Mrs Johnson having stuck her nose into the museum's aesthetics may just be click bait for their website, as they have not a damn thing to say about how or why.

https://theaviationgeekclub.com/the-story-of-the-xb-52-and-yb-52-the-prototype-b-52s-scrapped-after-first-lady-lady-bird-johnsons-beautification-of-the-us-air-force-museum/

the entire article they wrote was many paragraphs, but all the they wrote that had anything to do with their claim that the 1st lady was to blame for the planes destruction, is this:  The YB-52 was donated to the US Air Force Museum on Jan. 27, 1958, having flown for 783 hours. It was on display for a time but due to a ‘beautification’ scheme orchestrated by First Lady Lady Bird Johnson, both the XB-52 and YB-52 were scrapped sometime in the 1960s. Exactly how the official museum of the United States Air Force was ‘beautified’ by converting one of the most beautiful aircraft ever built into razor blades and soda cans is not adequately explained in the available literature.