Were the radical left views of General Smedley "War is a Racket" Butler more widespread in the Marine Corps than we remember?

I ask because I was reading a history of the 1932 Bonus March on Washington by disgruntled World War I vets, and was surprised to see that the Army didn't want the Marines at the barracks and 8^th and I SW in D.C. called out to help, supposedly out of fear that some of them "would side with the revolutionaries." (p. 143)

You know, typical left-wing jarheads.