Yeah, about that whole "non-superpowered" part ...
"Please don't make this about Life Model Decoys."
Here, eat fan theory: Before his death and subsequent resurrection as whatever alien-revived semi-zombie the producers turned him into in Agents Of S.H.I.E.L.D., Phil Coulson was actually born in the 1930s. In fact, he features in Captain America: The First Avenger as a kid called Phil, waving a makeshift Cap shield on the streets as his mom calls him for dinner.
White guy named Phil? The evidence is pretty solid.
We all know how the movie goes down; the super soldier serum is lost when its inventor dies, and the good captain "dies" in a plane crash. What the movie doesn't tell us, though, is: What would the U.S. military do if they lost the way to make superpowered soldiers and their only living specimen? Take a collective, old-timey panic shit and scramble to restart the project, that's what.