I understand the polished version of the USAF survival knife is no longer made. I've got one I purchased some time ago. I want to know what kind of steel these were made of. Is it the same as the issue Camillus USAF knife? Are there any other differences from the issue knife, other than the polishing? Also, when were they discontinued? and why? I would think they would still be a great seller. After drooling over many an expensive survival-type knife, I went to my closet and pulled the Camillus out. It looks like it will do anything the more modern knives will do, and do it with a hint of history lacking in other knives.