Hey Enrico, does the serial number on your dogtag match the serial number on the Nara Enlistment record?
If so, then the Capt Pytel born 1915 that we are finding records on is most likely his son.
According to the Nara record, he was 54 years old at enlistment and "Enlistment for the Philippine Department".
Philippine Department was an organization of the Medical Corps. They were stationed in Manila in 1939.
His civilian occupation was "Skilled amusement, recreation, and motion picture occupations" which suggests a Signal Corps Assignment, he was probably a cameraman but at that age and being an officer he probably would have a Headquarters job. About 3 yrs after 1939 the Japs invaded the Phillpines ( ? early `42 ) and he would have out of there. How he ended up in Italy in `44 - `45 is anybody`s guess. in `45 he would have been 60 yrs old.