Seeking Deck Logs of USS Perkins

Hello.  I'm a social worker trying to help a Veteran in hospice (diagnosis Non-Hodgkin's lymphoma) get a claim processed for A/O exposure before his passing.  He states he served two six-month tours on USS Perkins sometime between 1965-1967.  He recalls being let off the ship one day "to look around a city" in Vietnam.    I am hoping a ship log may exist to prove that this Veteran had "boots on ground".  Any advice appreciated.  Thanks!