this experience will be gained given time
This works for pilots, where a new co-pilot can observe the decision-making and actions of the rest of the crew before moving over to the RHS in due course. But seeing as there is (usually) only one RadOp/WinchOp and one Winchman on board at a time, they need to have sufficiently thorough training and testing (before they reach an operational unit) that they can cope on their own from Day One, and then enough continuation training to consolidate and refine their skills once they are on the strength of an op unit.