The ship
USS LST-750 was a tank landing ship. She was laid down on 7 April 1944 at Pittsburgh, Pennsylvania, by the Dravo Corporation on Neville Island, launched on 30 May 1944, and sponsored by Mrs. Clifford S. Heinz. She was commissioned on 29 June 1944. Lieutenant Ralph W. Long, USNR, had her. DANFS names him at the commissioning and gives the initial W. NavSource's command table prints Ralph Waldo Long, USNR, and carries the tour through 28 December 1944. Neither account says he was killed.
The DANFS text used here is a 2013 reprint. It gives her the Leyte landings in October and November 1944 and one battle star. NavSource prints one Leyte window, 18 October to 6 November 1944. The current history.navy.mil page was not the text opened for this card.
28 December 1944
That DANFS reprint says she was lost to a Japanese aerial attack off Leyte on 28 December 1944. It does not say torpedo, and it does not name a destroyer. She was struck from the Navy list on 19 January 1945.
H-Gram 040, in the Mindoro supply-convoy narrative, says that at 1830 on 28 December an aerial torpedo struck LST-750 and she had to be scuttled. The place-word in the DANFS reprint is off Leyte. The place-word around that H-Gram sentence is the convoy.
Robert J. Cressman's Navy chronology for 28 December says Japanese air attacks against Mindoro-bound Task Group 77.11 crashed a kamikaze into LST-750. She was then hit by an aerial torpedo and scuttled by the destroyer Edwards (DD-619). The chronology's place is 09°01' N, 122°30' E. It is not a surveyed wreck.
An older chronology, the December 1944 sheet, says LST-750 was damaged by an aircraft torpedo off Negros, at 09°01' N, 111°30' E, and sunk by United States forces. The longitude does not match Cressman's 122°30' E. Both numbers are printed. Neither is a surveyed wreck.
NavSource has two frames of the launching at Dravo on 30 May 1944. The bow reads 750 on both. They carry no Navy negative number, and they are not the card photograph.