My dad (actually step-dad)Frank Arrigo was a member of the 503d. He and a PFC climbed a poll to raised the flag on Corregidor.
To find out more read: Corregidor 'The Rock Force Assault' by Lt Gen EM Flanagan, Jr. and it mentioned Dad's climb page 210. Dad's climb was mentioned in the older encyclopedia we had at home. The newer ones don't have it in them.
There are lots of pics and info on the page about the retaking of Corregidor.