Jake Holman knew some martial arts fighting

Maybe, but's there's a fine line between effective street-fighting and trained, hand-to-hand combat. Watch Jake Holman's (Steve McQueen) hammer fist and elbow blows and more, his body movements. It shows way too much finesse and refinement to be simple, duke-it-out street fighting. Steve McQueen had been taught serious hand-to-hand combat moves, most probably by the late Bruce Lee, and possibly by the late Bruce Tegner.

Yes indeed. I liked the way how Steve McQueen's Jake Holman character effectively illustrated how to fight in very close quarters. The use of his elbows to put down a bigger (if more fat) man is a good example. In real life, such use of powerful elbow blows would have cracked Navy seaman Stawski's ribs, or anyone else for that manner.

Much hand-to-hand fighting is done at medium to close to very close (grappling) range. Tae Kwon Do is an excellent example of long-range fighting using the legs backed up with medium range hand blows. Thai kick boxing is another good example. Karate is a fine example of specialized medium range combat. Western boxing specializes in medium range and close range fist fighting.
My point is, everything I've seen on the Internet about self-defense, eg, Krav Maga, Jujutusu, on the dangerous urban streets and on the battlefield seems to indicate the average person needs to be prepared for close-in (short punches, chops, elbows, knees) to very close-in (grappling) hand-to-hand fighting. Self-defense presumes most of the time that your assailant has the initiative and surprise on you. You don't have the time, ground space, and distance to engage in long-range fighting.

And also a pall bearer at Bruce Lee's funeral.