Prior to the events of Edge of Tomorrow the United Defense Force achieves a significant (if not their only) victory against the invading Mimics at no other place than Verdun, in which Rita Vrataski shines out as a hero and symbol of hope for humanity. This battle supposedly marks the turning point for the overstrained human forces and inspires them to their huge offensive during which the events of the movie pan out (yet, as we learn later as a deliberate attempt by the Mimics to inspire the humans with false hopes).
Now seeing that the movie seems to some degree ripe with military historical references, it seems unlikely that the choice of Verdun was made by mere coincidence, since the real Battle of Verdun was one of the most prominent, longest and wasteful battles of WWI and remains as a symbol for the inconclusiveness of an attrition war and the horrors of war in general.
But I fail to bring this into context with its significance in the movie. Was the choice of Verdun as such a prominent battlefield in the movie's backstory simply just "name dropping" as part of the movie's other historical references or is there a deeper connection between the real battle of Verdun and its significance in relation to the movie's story and themes or maybe even word from the film-makers/authors why this particular location was chosen? (An in-universe relation seems unlikely anyway, since the Mimics surely didn't know about its signifiance in human history.)