That cover might have been the inspiration for that book and movie (apparently being made? or something) about a US Marine Expeditionary Group going back to the time of the Roman Empure.
It’s been a while since I cracked a Ringo book - Posleen war series was the last that I read. Premis sounds a tad too close to reality but he is always a good read.
Looks like I will have to go pick up another one. Thanks for the tip.