My old man- WWII Navy vet, discharged medically from San Diego at age 18 after being treated for TB (still a nearly always fatal disease in 1945). He survived because he volunteered for an experimental protocol that included having 1/2 of one lung removed and IV's of an experimental drug called streptomycin that caused him significant increased hearing loss in addition to that lost by firing cannons during Normandy invasion. After his d/c, he made his own way home by working and hitching. Never told his family about being sick until he made it home and had to explain scars and need for repeated chest x-rays.
I saw him come home from work with injuries like a crushed hand, and several times with burns across the back of them from 600 F molten plastic, and he would just go back to work the next day like he wasn't hurting. He was the first plastic injection molding operator at Eastman Kodak in 1966, and became the best setup man and trouble shooter they had in Rochester, NY.
I know because I worked there for 3 summers while going to college, and heard him talked about when people did not know who I was. He wanted to transfer to their Co Springs plant, but his bosses wouldn't okay the transfer because of not wanting to have to try to replace him.
Also Charles Bronson, real tough guy and actor- His father died when he was 10 years old, so he went work in the coal mines until WWII, when he enlisted and won a Purple Heart when he was injured acting as an aerial gunner on a SuperFortress in the Army Air Service.
He played the claustrophobic "Tunnel King" in "The Great Escape", but few people realized how true his claustrophobia was, dating back to his mine work, yet he went through repeated takes in claustrophobic sets without complaint.
Thomas