Just finished reading " Malcom, Ben S. (2003). White Tigers: My Secret War in North Korea."

Here he explains the entire Special Operations were nothing like today's units. In Korea the s.o. were mainly organizers of native guerrilla fighters. The army had very little consideration for the entire idea of special ops or guerrilla fighting. He explains these tactics were used in WW2, but not carried over to Korea. A few people were picked to train partisans (North Koreans), and these groups although generally not looked at as very valuable, numbered in the 10,000's eventually. The units had to invent their own training as they learned. Tactics developed in ww2 were learned and forgotten. Eventually manuals and real trainers were dispatched, but then again, not carried over into Vietnam sadly. The Vietcong used guerrilla warfare to great advantage in fighting small numbers of fighters against regular army.

In Korea the army tried to use special ops to mainly do intelligence gathering to some success, although these native guerrilla units is where a lot of the learned experience came from to eventual evolve into today's special ops, I.e. Use of small groups, quick strikes, guided by special intelligence, operations deep behind the lines.

Tldr; spec ops in ww2 and Korea were grown ad hoc, without much structure, and teachings and command and control formations were forgotten and re-learned the hard way after each war.