Forgot to mention. I found conflicting information on LST-38. May or may not be of interest to you but one source indicates she was sold and scrapped in 1947 or '48 while another indicates she was mothballed and later converted to a repair ship. You can follow up on that if interested.
Found nothing at all on LSMR-535. Would have been a specially-modified Landing Ship, Medium. Double check the hull number you have.