An H-Net review from H-Soz-u-Kult, in German, has just been posted:
Christopher Allmand. The De Re Militari of Vegetius: The Reception, Transmission and Legacy of a Roman Text in the Middle Ages. Cambridge: Cambridge University Press, 2011. 450 S. ISBN 978-1-107-00027-8. — reviewed by
The original review is in German, but you can see a Google translated page of it here.