Gearheads of War

by Robert Leckie, and "With the Old Breed: at Peleliu and Okinawa" by E.B. Sledge.

Sledge and Leckie were both riflemen with the 1st Marine Division; Helmet covers the start of the war through Guadalcanal (where a great uncle died), and "With the Old Breed" picks up where it left off.
Between the two one gets quite a perspective on what it was to be a Marine grunt in the Pacific theater.

Prior to that I had read "Storm of Steel", by Ernst Junger.
Rather like Remarque's "Western Front", it follows a German soldier through the Great War.

Coincedentally, Junger is much more ambivalent about the conflict than Remarque; despite having seen more combat and having been wounded twice.