Your information obviously comes from his discharge certificate. This means only that 637th Tank Destroyer Battalion was the unit to which he was assigned when he was processed out of service and may or may not have been the unit with which he served overseas (he may simply have been transferred into the 637th to return to the U. S.).
He would also be entitled to the Republic of the Philippines Presidential Unit Citation (this was awarded subsequent to his release from active duty and thus wouldn't be listed on his discharge). The Philippine awards are not issued by the U. S. Government and must be purchased from private sources. I have access to a limited number of Liberation Medals as well as the PUC.