I have yet to commence in-depth research on this wartime staff aboard USS INDIANAPOLIS (CA-35) during dates I have provided. I am quite sure that some of their war reports have been preserved and are possibly located within NARA II (College Park, Maryland).
Do you have any staff photos on hand? I have one of which they all appear with VADM Spruance in front of number one 8-inch gun turret.
I would imagine that your father provided valuable intelligence regarding Navy/USMC amphibious operations, and liaison for VADM Spruance with theater Marine units.
Let me know if you require any information regarding photo I have.