Recently, my brother-in-law gave me this Ontario fighting knife to keep in my collection. He was in Laos during the war, maintaining aircraft, 1966-1969 and said that this knife was given to him by a pilot friend who didnt return from his mission, and that these were govt issued and popular with the aircrews. He recently replaced the sheath, as the original deteriorated. The knife blade is marked Ontario US. Is it possible that this is a Vietnam era Ontario? Incidentally, it looks just like the one carried by James Garner in the WWII movie Up Periscope; black handle, black blade, black sheath.