Here's a related book for you;
Amazon.com: Devil's Guard (9780440614234): George R. Elford: Books
The account of an SS soldier's escape from the eastern front after the surrender of German forces to the Soviets, and his enrolment in the French Foreign Legion and service in French Indo China.
The French created a whole "SS Brigade" of former German SS soldiers to fight their dirty war for them in Vietnam, riveting reading actually, some brutal stuff like strapping villagers to the front of their vehicles IOT not get attacked while on patrol.