From the 1973 "Gun Digest Book of Knives":
"Another favorite of the current twenty-two models available [of Randall knives] is the Model 18 attack-survival knife, which is available with either 5.5 or 7.5 inch blade. It has a sawtooth edge on top of the blade and a one-inch tubular stainless steel handle, which is fitted with a waterproof cap. Marketing for about $60 [1973 dollars, sadly], the knife was partially designed by Captain George Ingraham of the 94th Medical Detachment during his service in Vietnam.
"After receiving his knife in the war zone, the captain wrote: 'I have wrapped the knife handle with one layer of nylon monofilament--to be used as fishing line--and will tuck a couple of hooks in the handle. At sea or in the jungle, you can usually catch fish and eat them, if you have the gear. Over that, I have a small guitar string, which I propose to use in making snares for small animals. Fine music wire or black twine would be better, but we are limited in the availability of raw materials out here. Over the guitar string and monofilament goes a wrapping of surgical tape to keep the fine stuff from unraveling. On top of the tape, I wrapped two regulation leather bootlaces of black rawhide (although alternate black and brown would make a nicer design) and used the ends to make a wrist thong--essential if you find yourself out on the water. This furnished a good handle and can also be unraveled for use if needed. The handle accomodates twelve water purification tablets, ten Dexedrine tablets, and ten one-half-grain codeine pills with ease. These will enable a man to survive in the jungle for several days, ease the pain of injuries, and--with the Dexedrine--summon reserve energy for combat, escape and evasion, swimming water barriers, etc. The water purification tablets will each handle one canteen full of swamp water and make it potable.'"
"Another favorite of the current twenty-two models available [of Randall knives] is the Model 18 attack-survival knife, which is available with either 5.5 or 7.5 inch blade. It has a sawtooth edge on top of the blade and a one-inch tubular stainless steel handle, which is fitted with a waterproof cap. Marketing for about $60 [1973 dollars, sadly], the knife was partially designed by Captain George Ingraham of the 94th Medical Detachment during his service in Vietnam.
"After receiving his knife in the war zone, the captain wrote: 'I have wrapped the knife handle with one layer of nylon monofilament--to be used as fishing line--and will tuck a couple of hooks in the handle. At sea or in the jungle, you can usually catch fish and eat them, if you have the gear. Over that, I have a small guitar string, which I propose to use in making snares for small animals. Fine music wire or black twine would be better, but we are limited in the availability of raw materials out here. Over the guitar string and monofilament goes a wrapping of surgical tape to keep the fine stuff from unraveling. On top of the tape, I wrapped two regulation leather bootlaces of black rawhide (although alternate black and brown would make a nicer design) and used the ends to make a wrist thong--essential if you find yourself out on the water. This furnished a good handle and can also be unraveled for use if needed. The handle accomodates twelve water purification tablets, ten Dexedrine tablets, and ten one-half-grain codeine pills with ease. These will enable a man to survive in the jungle for several days, ease the pain of injuries, and--with the Dexedrine--summon reserve energy for combat, escape and evasion, swimming water barriers, etc. The water purification tablets will each handle one canteen full of swamp water and make it potable.'"