Both Feustel and Arnold completed several spacewalks which took them beyond the confines of the ISS and into the vacuum of space.
Many Russian cosmonauts, past and present, train and stay with their families in this facility, which is run by Roscosmos, the Russian space agency, it added.
NASA sought on Wednesday to tamp down speculation that sabotage caused a tiny hole found last month in the side of a Russian module docked at the International Space Station, but the mystery remained unsolved.
The International Space Station is a habitable artificial satellite in low Earth orbit.
On the Ground today flying Americans Richard Arnold and Andrew Feustel and Russians Oleg Artemyev.
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The puncture has since been patched with tape and sealant, halting the oxygen leak, and officials said the current crew, consisting of three USA astronauts, two Russian cosmonauts and one German, were never in any danger.
Astronauts have said the 2-millimeter hole is a clean one that was "clearly man-made", not a jagged strike from a micrometeorite or space junk, though the joint investigation has not yet confirmed that.
ISS astronauts are planning a spacewalk in November to gather more information on the hole.
The crew was all smiles on return to Earth, with Artemyev first out of the descent module and shown tucking into a fruit and vegetable feast that included a giant cantaloupe melon in footage broadcast by Roscosmos. He wrote "spasibo" (thank you) and signed his name on the craft in chalk. The 14th SpaceX Dragon flight was the first to arrive at the station, in April, shortly after the three crew members did, bringing supplies and equipment.
One of them made a music video.