of course the USAF does not have a Delta Force the knives were actually a Manufacture’s Error, Delta Force was a unit of the U.S. Army’s Airbourne Division.
The Parker Vietnam Boot knife Sets according to a Bulletin put out by “Cutlery World” Not part of the U.S. Air Force that is etched on each of the knife blades & only 600 sets were manufactured making each set Very Collectible. The OAL of each knife is 11-1/4", each knife blade is double edged and is 6” in length, one blade is etched “U.S. AIR FORCE 101ST AIRBOURNE”, the second blade is etched “U.S. AIR FORCE DELTA FORCE” and the third blade is etched “U.S. AIR FORCE SCREAMING EAGLES”, the tang on each knife is etches with the “PARKER CUT. CO. SURGICAL STEEL & JAPAN” Logo & all are engraved with the same serial #. This knife is numbered 345
I bought this knife loose, not part of the set and in mint condition. I than had a custom leather sheath made to fit it. There is not another like it. My Dad a retired USAF Officer would have turned over in his grave if I did not recognize Delta Force it as an Army Division.
more photos are on my AAPK store; http://www.allaboutpocketknives.com/onehikes