Yep most stuff is just as our history but towards the 'end' of the war things diverge (germans develop V-gas which as well as killing you reanimates your corpse to kill more people; USA manhattan project is cut short with the team being butt and the plans being stolen) so in current game time the year is 1949 and the war has descended into a stalemate broken only by small engagements. The system has all the normal WW2 stuff as well as various 'fantastical' units mecha, vampires, cyborg, werebears etc and of course zombies!
http://www.westwindproductions.co.uk/catalog/secrets_of_the_third_reich.php