6. My Dad washed out of the Navy program that used the Stearman trainers....
...left the Navy, joined the Army, and ended up as a nose-gunner on a B-24 stationed on an airfield in Italy. Never talked about any of his WWII experiences until he was 76 years old and had a health scare. I did some digging and found all of his former crewmen and gave Dad their phone numbers for his 78th birthday.
One of my Mom's brothers was a radio operator on the unarmed supply planes that flew from Burma over the Himalayan Mountains into China. It was only after he had been passed away for many years that we discovered he had flown on more than 80 missions and was highly decorated. I talked to a guy who had written a book about his experiences "Flying the Hump" to get an understanding of what my uncle went through and why he never talked about it.
One of my wife's uncles was killed in the heavy fighting in Germany's Hurtgen Forest in 1944. Her family never talked about it until I did some research and found out what happened straight from the guys who fought in his unit. That was some terrible stuff, believe me.
I have other relatives who fought in WWII, some in the Pacific and some in Europe. But like you discovered, they rarely talked about what they did unless they were really pressed to do so...and some never did.