1 ) i be not weapon expert and but even i can see difference between u. s. army riffle in wwi and wwii . in movie we can see private and arm with m1 garand ( invent in year 1932 . ) and not authentic 1903 springfield ( aka silent death ) and who privates use until wwii . difference m1 can load 1 and 5 time more ammunition and 3 time more fire rate . m1 be semi automatic and springfield require reload after every shot . little difference . 2 ) german army uniform have borrow from 1940 year too . especially helmet . german helmet until end of wwi have significant pike on top and we can not see even one in movie . and if we make little additional search in archive how much truthful be this true story . i be surprise and how much truthful can be film director in a pursuit of cheap propagation .