Their Boeing Starliner spacecraft experienced issues last summer, delaying their return and requiring them to use a SpaceX Dragon capsule to get back to Earth.
They splashed down off Florida's coast alongside Crew-9 members Nick Hague and Aleksandr Gorbunov.
Despite delays, the astronauts refuted claims of being "stranded" or "abandoned," a narrative pushed by the Trump White House.
President Trump had criticised the Biden administration for the astronauts' extended stay, calling them "incapable" of handling the situation.
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