I saw Steve being approached by Eskrine and then being recruited by him.

(A Few Days Later)

So today's the day,Steve is going for his "procedure".I saw Agent Carter escorting Steve with her and then I entered along with the Colonel and the government officers blending in with them.

As the procedure was going on I picked up a vial or two.And before you all judge it as stealing,realize this that this serum is the most close a person has ever come to enhancing humans strength without side effects!!!.Being here also presented me with an opportunity to save Eskrine but I didn't pay heed to that train of thought as Eskrine's dead is an important plot point for Steve and imagine if Eskrine survives,the United States Army will probably force him to give up the secret behind the serum and create an army of super soldiers.I shuddered at the thought of thousands of people all enhanced with the super solder serum going to fight.Pretty sure that the world war would then end with USA becoming a dictator power over every other nation.Though it would end the fight way sooner.

Everything proceeds just the way it did in the movies,Steve comes out jacked with everyone surprised at his change. Eskrine getting shot and there is panic in the room.Steve runs after the Hydra agent while I subtlety leave.

After leaving I immediately go and get myself enlisted.They did a series of test and even took some blood.All the people there were surprised as I had more strength than a usual human.Not by much as I did restrained myself but yeah enough to get noticed by some higher ups to pull some strings and have me beside themselves protecting them.A job I did well enough to earn their trust.

Nothing differs from the movie Steve is then made a poster boy for war propaganda till he goes and rescues Bucky and the other and forms his Howling Commandos.And through some divine intervention (cough cough my magic)the higher ups decided to put me in the Howling Commandos.

Imagine Steve's surprise when he saw me.