When did Bucky really become a super soldier

This is my question, most everything I’ve read suggests that Bucky was injected with something when he was a POW in CA:TFA which allowed him to survive the fall. But here’s the things through out the whole move there is no sign of super strength or stamina, but as we see in CA:TWS he’s clearly more durable, faster, stronger, and well everything. So was he injected with like a booster shot or something else later on that gave him the rest of the goods? I would really like to hear what ever has to say.