Is it true tht some former American military members joined Nazi FASCIST RACIST groups? What happened to PATRIOTISM?

  From the foundation of the Klu Klux Klan (KKK) in the late 1800s up until the 1940s, there were numerous US servicemembers who were staunch Klansmen, very vocal and very active in that organization's hateful and racist domestic terrorism. They practiced openly and most of their efforts were directed inward as a cancer on the body of the armed services, or more plainly put, against other members of the military. The US government was also complacent in both denying certain people's entry into the military or into particular military units. Segregation by race (ethnicity) was strictly codified in the armed services. For instance, black Americans could not even enlist in the Marine Corps until the manpower shortages in the middle of World War Two forced the issue (1943). Blacks and Filipinos were restricted to serving as stewards in the Navy and Coast Guard, it wasn't until the 1950, 1960s and 1970s in increments that that was fully abolished.  There was rampant discrimination in the military against Hispanics and Jewish people also.  These are minute examples of more widespread instances. No one should pretend that history doesn't exist, nor that these things are suddenly taking place with no precedence behind them.