As Ron Krebs demonstrates, aspiring populist demagogues love dead soldiers but hate serving officers. The former can’t answer back when their memory’s exploited, but the latter are the greatest potential obstacle to demagogic authority - hence efforts to cow and politicise.
Update: in just over year Hegseth has now fired the CJCS, CNO, CGC, Air Force CoS and Vice CoS, Army CoS and Vice CoS, Head NSA, Head DIA, and IG.