Before Lonesome Road, I always assumed we were on our way to helicopters with the development of Vertibirds at the time of the Great War, but if you look at that 'Sunshine Roofs' or whatever it's called in Lonesome Road, you come outside on a Helipad, so does this mean there were Helicopters before the War now?

http://en.wikipedia.org/wiki/Focke_Achgelis_Fa_223
Anything that happened in WW 2 is canon.