The difference between hollywood actors in a war movie and the real soldiers in battle is how old the soldiers looks after being in combat. The soldiers being 18, maybe a few years older while many of these actors are 30+ and still look soft.
The average WWII serviceman was a draftee (62%), 26 years old, 5-foot-8-inches tall, 144-lbs with a 33-1/4-inch chest, married, had one child, and an ninth-grade education.
The increase in the chest-to-waist differential inductees underwent during basic training/boot camp was the greatest of any war since the US began keeping records of the measurements of military inductees, which goes back to the WBTS.
In WWII in specific, the average inductee's chest measurement increased by an inch at boot camp while his waist shrank, despite putting on 5-20 lbs.