I'm trying to remember the name of a science fiction novel about cloned soldiers that I read many years ago. It was probably written in the 60s or 70s.

I do not remember too much of it except that the soldiers were cloned from war heroes, and in batches, so a human squadron commander might be looking at his squad of 6 Claire Chennaults or 6 Manfred von Richthofens who were perfect in every way, and he had to earn their trust and loyalty. The clones knew they had been bred for war and would never know another life. Humans disparaged the clones when away from them calling them “spam in a can” and one of the clones finally told the officer that they referred to humans as “uties” [uterus-born].

It was an interesting read and I’d like to find it again. Probably written in the 60s or 70s.