I flew on KC-135 tankers in thr Air Force during the 80's and carried a SAK "Picknicker", which I believe was one of the early lock blade SAK's. Our issued knife was a switch blade parachute knife, which I carried as well.
In the 90's I switched from flying to sailing research vessels in the N Atlantic & Antarctica. Still carried the SAK but added one of the early Gerber blunt nose multi's. The Gerber worked well, except it pinched the hell out of my palm if the jaws slipped off whatever you were using them on. I also tried an original LM PST but preferred the one-handed flick opening of the Gerber. After Gerber solved the palm pinch problem, I got a Pro Scout which I loved because of the replaceable metal hack saw blade, as the boats I sailed were steel and the blade was a nice addition.
The salt water never bothered the SAK and the Gerber. All they needed was a frequent freshwater rinsing and occasional lube. The LM however, tended to stiffen up quickly if you didn't stay on top of it.
BTW, I still carry the SAK and Pro Scout, although the blade on the SAK is getting mighty skinny!