Funny, I was just reading about his liberation last night not even making the connection that today would be May 6th, the day he surrendered.
Is that book “Never Plan Tomorrow” by Joseph Petak? That’s a very good book, and it has copies of the mission report of that OSS mission written by it’s commander. The prison they liberated was Hoten Camp. It’s where my father spent most of his captivity. He was amoung the original group who were transported on the Tottari Maru, and stayed at Splinter Camp.