I had a TL-29 in 1965 in Vietnam and it would rust if you looked at it, I literally would clean it and wipe it down with oil daily. We could not get "Demo" knives (they came in our Demo kits) until one day on the street of flowers in Saigon, sitting on the side walk an old Vietnamese lady was selling stuff and there were Demo Knives still in the wrapper, so I bought one, probably why we could not get issued one as they were stolen for the black market. I carried that Demo knife for the Rest of the tour, thru Ranger School and back to Vietnam. A friend borrowed it to cut leaflet bundles and I never saw it again. The next three Demo knives all had the blade springs break, just opening the blade. Then I saw a Swiss Army Knife that the recon teams from CCC, SOG were being issued and bought a SAK from Corrado Cutlery and never looked back. Not sure why Horsewright's customers will not buy stainless as I knew lots of men in SF that carried stainless steel knives, from Hibben's, Randalls, and most of all Buck's.
I also seem to remember adds by Schrade saying their stainless was so good that they did not have to mark their blades "Stainless' like everyone else did, just 'Schrade +". John