My uncle was similar. 503rd Parachute Infantry Regiment. He told us three things. He jumped on Corregidor, the Japs didn't give up and had to be burned in their holes, and his unit was hungry a lot. I found him in a unit photo on the internet.
My uncle apparently was in great shape when he volunteered after Pearl. He lost about 30 pounds on active duty and didn’t gain it back for about a year after WWII ended.