Possible double meanings on "Red Castle" "Green Castle". One of my old CMC's, D.M.Shoup, "David Monroe Shoup was born in Battle Ground, Indiana, on December 30, 1904. He graduated from DePauw University in Greencastle, Indiana, in 1926."
D.M. Shoup was an outspoken critic of the Vietnam war. He was an egalitarian ending the use of "swagger sticks" and much other elitist bullshit.
http://www.arlingtoncemetery.net/shoup.htm
He was one of the first critics of industrial war and paid the price for it. No one knows his name today.
Except for us. Semper Fi, D.M. Shoup, Semper Fi.
https://en.wikipedia.org/wiki/David_M._Shoup