Casting of Mitchum as Pug Henry
Mitchum was one of my favorite classic actors. However, I think his casting as Pug Henry was off target. About the only similarity was their taciturnity. Pug Henry was a Commander/Captain and 49 years old in the book. He was 5'6." Mitchum was 66, and despite a facelift a few years before, looked his age. Mitchum was 6'2." He was quite overweight, as compared with Henry in the book, which portrayed Henry as "board flat." If anyone was still serving in WW2 at age 66, he would have been a general or admiral, certainly not a commander or even a captain.
Many of the stars in the movie were older than their characters in the book, but at least bore a reasonable physical resemblance to them. Mitchum looked like he should have been playing Halsey, the Vice Admiral, whom he did in fact play in "Midway" some 7 years earlier. Plus in the film, Mitchum kept sucking in his gut. He had become a fat boy, and his magnificent acting skills just couldn't pull it off.