Much of the $4.2 billion the Air Force says it would save by retiring the A-10 attack fleet wouldn’t actually be saved, because it would come from personnel who would be shifted to the F-35 Joint Strike Fighter.

In its fiscal 2016 budget, the Air Force estimates it would save $4.2 billion by retiring 164 of the attack aircraft, nicknamed the Warthog. The cuts would remove all A-10 active squadrons and cull 21 assigned to the Air National Guard.