According to the application for a Headstone, when the body was returned from overseas in 1949, he was buried in Memorial Park Cemetery, Dayton Ohio also known as Dayton Memorial Park Cemetery.
He is listed here:
http://dmpbow.cemeterydata.com/burial_search?name=molen
Dayton Memorial Park
Name: John E. (1st Lt) Molen
Date of Birth: 00/00/0000
Location: Dayton Memorial Park
Dayton Memorial Park
Section 5
Lot :129
Space :3
Age:
Gender: M
Date of death: 12/02/1944
Service date: 09/03/1949