True about my dad. Served under Patton in WWII and NEVER once talked about the combat. He would tell the goofy stuff. I asked him once if he had ever shot anyone and he got real quiet and said he never had to fire his weapon. He was a radioman (which I knew) and he said he always had a guy assigned to him.
They had Germans advancing up a hill toward them once and he was ready to open up when they got word that there were more GI's coming up behind the Germans so they held fire and the Germans surrendered. He never said it, but I think he was real happy it turned out that way. He ended up diving out of a half-track that was flipping after hitting a shell hole. Broke his wrist and the war ended while he was in the hospital.
He turned down the Purple Heart because he didn't think he deserved it. After the war he was working as a clerk when he saw his own papers come across his desk. He was a few points short of going home and the PH would have done it...so he gave himself the Good Conduct medal and got shipped home.
My best friend served in Nam and he's the same way. Funny thing is he was a radioman, too. He and my dad would get together and talk but if anyone else came around, they'd change the subject.