There is a small bit of Aliens (called Thules) in one book. The author tho' tries to keep all the x-planes and tech. to thing the Germans and other powers had on the drawing board,but just didn't have time develop. This is why they war just lasts a year and a half longer,but the Allies still win. One ending (of the three different ones) has Hannah Reich fly the Sanger orbital bomber (which was real)into orbit, it misfires and she ends up leaving earth and flies towards the moon. The Germans did have a death ray program called "project Odin bolt". It is in one the tech. manuals ;)