I'm looking for a Bucky/Tony fanfic where Tony travels back in time and ends up in the 40s. He decides to join the war effort as a soldier and quickly climbs the ranks. I think he still has the arc reactor. The story is told as Tony tells about the events to Nick Fury in the future. I think it was written before the Winter Soldier movie came out and was quite long but still unfinished when I read it. It's on Ao3.
Some scenes/plot points I remember:
The time travel was caused by aliens, I think. I remember a scene at the beginning of him talking to them before they set him off. Might be wrong about this one though.
Tony gets kidnapped (instead of Bucky or with him) by Hydra and is injected with the super-soldier serum.