O.K. We know there is no true "survival knife', only appropriate knives for the many tasks we may face. There are various military fighting/utility knives and a few aircrew knives. I have been able to find some information and will be posting modifications later if anyone is interested. The classic A/F survival knife is currently produced by Ontario and Camillus. Both are 1095 carbon steel. Ontario has a Rockwell of 50-53, with a 30 rockwell tang that becomes harder from the heel of the blade to the edge. Camillus is harder, with 53-58 rockwell in the blade. The Camillus' clip point is deeper than the Ontario and more prone to potential breakage. It also has a treated leather handle against rot. The british offer the Mod4 knife. This has a uniform rockwell of 52 in a carbon/manganese steel. At 1/4" uniform thick and a full scale tang you do not break it. I will describe usefull modifications if there is interest ( and I get Barry paid and a A/F sent!)