PAL RH-36. The original Remington version has a larger pommel. PAL bought Remington's knife business, I think about 1940.
Look at CAG Lee's knife in, The Bridges at Toko-Ri. Same knife. Lt. Brubaker(Wm. Holden) wore a Western equivalent. The knives are seen on their survival vests. Look for scenes after the second attack on the bridges, before Holden's plane crashes. The Navy fighters are Grumman F-9 F Panthers. See the clip on YouTube. After his crash landing, Holden's character draws his S&W Victory Model .38, the gun issued to USN pilots then.
[ame]https://www.youtube.com/watch?v=lF-SC-9b7tc[/ame]
I doubt that either pilot got the knife from the Navy, but both were very popular private purchase items then, before the official jet pilot's knife was adopted and issued to both USN and USAF aircrews. Some pilots still prefer private purchase knives.
The PAL RH-36 is NOT an official knife, neither a MK. I or MK II. The MK II navy knife is just the Marine Ka-Bar in a different, plastic or fiber sheath. The MK I knives have some variation but are all smaller.