True situational awareness is almost unteachable (although guidance can be given as to the aims) because it depends on the amount of spare processing power left after the requirements of flying the bird, and therefore also depends a lot on ones familiarity with the aircraft you are flying.
It is interesting in this context that in combat, the vast majority of kills in WW2 were achieved by a very small number of pilots possibly helped by their ability to keep track of a complex situation (and shoot straight).
In nearly 50 years of instruction in and out of the military, I have flown with a only a few people who were really the tops in SA. It was an awesome experience and almost completely independent of piloting skill.