Hi Joyce, Frank C. Allen Service Info: LCPL US Marine Corps Persian Gulf; killed in action Persian Gulf Born: 10 Sept 1968 Death: 29 Jan 1991 Buried: 21 Feb 1991, National Memorial Cemetery of The Pacific (Punch Bowl), 2177 Puowaina Drive, Hawaii 96813, Section L, Site 144.
Please accept my condolences.
There is an obituary volunteer at freepages.genealogy.rootsweb.ancestry.com/~obitl/volhi.html .
However, I have a feeling that he didn't live in Hawaii before entering the service. Therefore an obituary might not appear in the Honolulu newspaper. It might have been published in his home town newspaper. Also you mentioned that he had several grandchildren when he died; grandchildren at age of 23?