In Captain America #180 (December 1974) Rogers becomes disillusioned with the United States government, when he discovers that a high ranking government official (heavily hinted to be the then President of the United States Richard Nixon) is the leader of the terrorist organization known as the Secret Empire.

Rogers then decides to abandon his Captain America identity, feeling that he cannot continue to serve America after this latest discovery has shattered his faith in the nation's status. However, a confrontation with Hawkeye (disguised as the Golden Archer) forces Rogers to realize that he cannot abandon a life of heroism, and he subsequently takes on the name "Nomad" (as it means "man without a country") adopting a new dark blue and yellow uniform with no patriotic markings on it at all.

This identity is short-lived, with Rogers maintaining it for a mere four issues of the comic to varying degrees of success; he even trips over his own cape at one point. At the conclusion of Captain America #184 (April 1975) Rogers returns to the role of Captain America when he realizes that he could champion America's ideals without blindly supporting its government.

Steve Rogers has never blindly supported the American government.

To be fair, that was the whole point of Civil War.