I regularly look over the internet to view vintage photos of US personal actually wearing belt knives. I have only seen a few photos of the 225's being worn, However Cole list many 6" utility knives like the above Kabar commando, but I have never seen a photo of one being worn. I have a number of these 6" utility knives made by several different manufactures but again I have never seen one being worn. If anyone has such a photo I would appreciate seeing it. If you will check old ads from Outdoor Life and Field and Stream from the 1950's and 1960's there are many ads for these type knives for sale. Apparently surplus from the factory as they are listed as new. yet the factories stopped producing them after tyhe war. One interesting brand EGW, is listed as a WW2 knife and I have never seen a photo of one being worn, though I have one that has an inscription, "SGT. TAYLOR" etched into the sheath.
P.S. On my above incorrect identification of an early get pilot knife, as far as I know only 2 companies manufactered these early knives. Imperial and Schrade Walden.