The USAF has been neglected for a long time. The service has seen reductions in both headcount and airframes with no gains in efficiency or effectiveness.
Too many types of aircraft to operate and maintain, with too few people to do it and too few available airframes to maintain a combat capability.
A friend who served was assigned to fix broken planes quickly. He and his fellow mechanics could be punished for not being ready to make urgent repairs, so they maintained a stock of commonly used parts in the hangar.
One year, a congressional efficiency mandate required that AFBs return any parts that hadn't been issued in the previous (90 days?). Returning their stock just because it hadn't been needed in the last 12 weeks undermined their readiness requirements, so the staff found a way around this limitation: periodically discard qty 1 of any seldom-used part and order another one to show proof of need. The congressional anti-waste attempt only served to fill their dumpster.
Along with investigating airframe selections, it would be worthwhile to audit the branches for these kinds of perverse incentives, to hear from people at all levels about which policies are helpful and which cause needless waste.