Good, so you actually know what makes these things so complicated? If operating it is simply pushing X number of buttons in a specific unchanging order then training by someone who can write down that sequence would take a few days at most. If the order changes depending on circumstances, then yeah, I can see it being a bit more complicated, but like I said, if it doesn't require fine motor skills, 6 months seems like bullshit.
Another item that is also overlooked in the training sequence is that the operators are also expected to perform preventive and rudimentary field maintenance on the equipment itself.
Separate crews are not assigned when in the field.