Crm course did not exist when I started in 1964 and the usa selection tests were based on the staynine military ww2 single fighter pilot selection profile.
Some years later after a United out a fuel incident it was found the cockpit was full of the right stuff for fighters but basically the wrong stuff for multi crew.
United then did a lot of work to retrain attitudes of its pilots with a Swedish psyco. friend of mine attached to SAS who wrote the CRM manuals for them.
The selection tests are today different from 1964 and the wrong stuff has either been modified by education or gradually eliminated as the pilots retire.
Teaching CRM to crews is a very interesting job and different techniques are required in different parts of the world.
It gets really interesting and is essential where the crews are multie national and also multi faith.