I can understand the "no prvately purchased" desert footwear thing...unless a line is drawn somehwere there are those who would go flying in flipflops.
That said, as I see it, it's verging on negligence that the correct footwear/flying clothing has not been purchased or provided. Do those in so-called power not understand that if it weren't for folk on, for example, the SH force BUYING their own boots, sleeping bags et al, things would have ground to a halt long ago.