The Nomad Storyline

Printed in Captain America and Falcon #181-188, Jan. 1975 - Nov. 1974.
Deciding on a new superhero identity, Nomad, Steve Rogers makes his presence known even as another man decides that he is worthy (he isn't) to wear the Captain America costume. Peggy Carter is more than a little confused, at least until duty at S.H.I.E.L.D. put her back in action tracking down the person who put the Falcon in the hospital.