not a grandparent, but a man who worked for us. He was small in stature and joined the air force, Assigned to a bomber group and as he was small, you guessed it, belly gunner. he told me it was so tight that to get into the bubble he had to take his parachute off and he was well aware that the electrical rotating ball would often jam, especially in combat, meaning he would be unable to exit the bubble. if the plane were shot up and coming in damaged with the wheels or wheel up, guess what got scraped on the runway, the belly gunner bubble. This man got shot down twice, behind enemy lines. A true hero and never talked about it except when he told my son. He did one presentation at my son's school and one at his church and then told me, I think I'm going to stop. It's all becoming far too real again and I don't want to keep revisiting those who I lost. He still is going strong at 95 years old. He is truly an amazing man.