I was directly involved in the hiring process for pilots at an Air National Guard unit, for many years. Consistently, the worst pilots (had the most trouble in training) were the former Army and Navy helicopter pilots who were trying to transition to fixed wing jets. They had good "hands", but their brains worked at 100 knots, and they ALL had difficulty managing the 400+ knot jets. All of them.

On a side note, we looked at the degree as a box that had to be checked (to be a Commissioned Officer in the Air Force.) Oddly, those with engineering degrees seemed to do really well, or struggle (not much in between.) We looked for well-balanced (rounded) individuals who would be decent to hang out with on a deployment. Pilot training would weed out the weak.