Absolutely true!! A great deal was made out of Oswald's communist sympathy and ties. Any attempt to diminish his politics has come at least several years after the assassination.
The hatred and loathing of marines to the commies was all pervasive at that time. The memory of the slaughter and torture of fellow Marines by the commies in Korea was still fresh. If Oswald was a true commie, he would have been lynched; beaten to a pulp: or harrassed out of the corps.
It is hard to believe the Corps ordered his officers to protect and leave him alone. The marines all of a sudden in Oswald's case becomes as pink as the ACLU? Not buying it.