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Short answer: Budget cuts. Lots of pieces in this search and some wonderful videos on YouTube:
http://www.google.com/#q=aberdeen+proving+ground+museum+closing
Steve
A straight Google search brings up lots of stuff about them but this page looks like it might be a good example.
http://wwimodeller.co.nz/walkaround-holt-5-ton-artillery-tractor-model-1917/
They seem popular at farm-type tractor shows.
Steve
There's one very close to it on G503 from Red Motor Car Company. The dataplate on that one says 1917 and it includes a photo of a guy driving it.
http://g503.com/forums/viewtopic.php?f=24&t=164970
It needs to be at Gilbert in the fall or Sussex next year.
Steve