It is actually just trying to recreate the Urban style modern warfare with random weapons and vehicles from the period. The warfare in the OP is closer to WW1, especially with the hand-held machine guns. WW1 shoulder get-up was more akin to this: http://www.sofmilitary.co.uk/media/2...er_pose_01.jpg
And Trench-warfare was basically what was done till the very end of the war. (except in the East)
This only really changed with the Ludendorff offensive in 1918 who managed to break through the trenchs, and was a race of time to win the war before the Americans arrived in significant numbers.
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