I can understand the cutbacks with A10s. For CAS in a conventional war environment, they can be replaced with F16s, F15Es or F35As. A prop platform like the Super Tucano or AT-6B can fill COIN CAS roles more cost-efficiently.
Putting KC-10s up for retirement is a puzzle. Wouldn't it make sense if they instead retire older KC-135s? However, here's what I noticed. KC10s may be younger but the USAF is only using them as tankers. Compare that to the KC-135 which also has RC-135, E3 and E8 Joint STARs relatives in service.