it probably depends on how you refer to knife fighting.

certainly there were many, many mutual charges with fixed bayonets during WWII, especially in the Pacific campaign against the Japanese.

while for obvious reasons people fired their rifles on the move and used the bayonets as a last resort, there were plenty of soldiers who got stuck with a serious or lethal bayonet wound.

there are also plenty of accounts of Filipino small units running across Japanese small units in the jungle at close range, and the resulting firefight being at a range where blades were useful – but these fights were with bolos, bayonets, and the usual machined katana-alike that were issued en masse to Japanese officers, not with hand-held Ka-bars or anything similar.

there are also plenty of reports of the British Gurkha units using their khukris as an assassination tool during the war.

the common thread in this is that people either used what are effectively short or long swords, or a knife that’s turned into a spear by mounting it on a rifle that gives standoff distance for the user – and if possible, they prefer to use the element of surprise to kill with them (see Gurkhas)

pretty much the same principles that applied in the era of the phalanx and the gladius, really.