US troops have never invaded Iran. Maybe you are thinking of the 1980 Iraqi invasion? https://en.wikipedia.org/wiki/Iraqi_invasion_of_Iran

The 1953 coup in Iran was organized/supported by the CIA, but did not involve US troops. https://en.wikipedia.org/wiki/1953_Iranian_coup_d%27état

During the 1979–1980 US embassy hostage crisis, there was an aborted attempt to rescue American hostages. https://en.wikipedia.org/wiki/Iran_hostage_crisis