One of the future missions for the Crew Dragon capsule is going to involve Mr Behnken’s wife, Megan McArthur – also a Nasa astronaut. Mr Behnken and Mr Hurley returned to Earth after spending a total of 62 days in space.
The primary purpose of their mission was to demonstrate SpaceX’s Crew Dragon spacecraft.
Already, the two astronauts have revealed some of their thoughts about how successfully the capsule pulled off the trip.
Mr Behnken said in a press conference yesterday: “From a crew perspective, I think it’s definitely ready to go.
“There are things that can be improved, just like even with the final flight of the space shuttle.
“They do need to have a look at the data from our entry; it’s not just the end users’ anecdotes of how well it performed.
“They will do a very thorough review both on the SpaceX side and the Nasa side to make sure they are comfortable.
“It took years in the making. I think Doug and I have been working at it for a good solid five years to get to this point, and it’s just awesome to see it to fruition.”
Two future missions – Crew-1 and Crew-2 – are already scheduled to carry more astronauts to the ISS, and this time they won’t be tests.
READ: SpaceX latest: Tim Peake shares stunning photo of space as Crew Dragon reenters Earth
However, their stay ended up being longer and busier than initially anticipated.
The two-month stay saw the two US astronauts assist in the day-to-day running of the ISS, with Mr Behnken even conducting four spacewalks.
The spacewalks – conducted alongside ISS Commander Chris Cassidy – saw Mr Behnken leave the ISS in a spacesuit to float around spaceship from the outside.
During the trips into the sheer vacuum of space, the two astronauts installed new batteries on the space station.
Mr Hurley also assisted by controlling a robotic arm from inside the station.
In addition to the spacewalks, Mr Hurley and Mr Behnken helped conduct various scientific experiments astronauts are expected to perform whilst working on the ISS.
One experiment involved observing how water droplets form in the weightless environment of space, according to the New York Times.
The two astronauts also assisted in the installation of new equipment inside the space station.
Mr Hurley and Mr Behnken’s departure means Mr Cassidy and two Russian astronauts Anatoly Ivanishin and Ivan Vagner are the only crew left aboard.
They are due to depart in October, when another crew of three will arrive to relieve them of their posts.