Aloha, the RH stands for Remington Hunter as it was a civilian knife made by Remington prior to the war. When PAL bought out Remington they continued to produce.Good info here:http://sharky-fourbees.blogspot.com/2018/02/rh-pal-36-ww2-us-fighting-knife-with.html
This ones better than most. https://www.ebay.com/itm/MINTY-WWII-US-Fighting-Knife-Bowie-RH-36-PAL-USA-USMC-USN-Pilot/392273438299?hash=item5b5551a65b:g:JW0AAOSwJ8hcqpHg