One last thing. When I was 19 yrs old, 80% of every military aircraft I was around was completely maintained and repaired by other 19-23 yr olds with very limited experience that were not professional aircraft mechanics or electronic techs, but we had DAMN good FSM’s and instructions to work with. The contractor’s that built the aircraft and systems were required to provide that info.
I’m willing to bet it’s still that way with military aircraft.