Ray Gun Revival has posted the 54th issue of their pdf magazine, in which in addition to free fiction of the ray gun variety (and who doesn't love that?) there are reviews and features, including Donald Jacob Uitvlugt's review of Three Unbroken.

Three Unbroken is rollicking good fun in the best tradition of military SF. I enjoy each installment of Roberson’s sequence more. I will definitely be looking for the next installment.