This is a great fan theory about the James Buchanan “Bucky” Barnes wall in the Captain America Exhibit, located in the Smithsonian Air and Space Museum in Washington D.C.:

And here is a screenshot of the Bucky Barnes “A Fallen Comrade” wall in the Smithsonian:

Here is a close up so you can read it better:

We salute you Captain America and the Howling Commandos!