Inspiration4's call signs: The crew of SpaceX's all-civilian mission have special nicknames

CAPE CANAVERAL, Fla. — SpaceX is gearing up to launch one of its biggest missions yet: its first all-civilian spaceflight. 

As part of the mission, called Inspiration4, one of the company's Crew Dragon spacecraft will ferry four people — Jared Isaacman, Hayley Arceneaux, Sian Proctor and Chris Sembroski to space and on a three-day journey around the Earth. Liftoff is set for tonight, Sept. 15, at  8:02 p.m. EDT (0002 Sept. 16 GMT) from NASA's historic Pad 39A of the Kennedy Space Center.

Prior to heading to Florida for the launch, and roughly a month before liftoff, the crew received something very special. In a naming ceremony that took place on Aug. 8, each member of the four-person crew received a unique call sign, a type of nickname that astronauts and military pilots are given during their training. 

You can watch the launch live here and on the homepage beginning at 3:45 p.m. EDT (1945 GMT), courtesy of SpaceX.

Live updates: SpaceX's Inspiration4 private all-civilian orbital mission
Related: How to watch SpaceX's private all-civilian Inspiration4 launch online

The Inspiration4 crew, from left: Chris Sembroski, Sian Proctor, Jared Isaacman and Hayley Arceneaux. (Image credit: John Kraus/Inspiration4)

The Inspiration4 crew went through much of the same training exercises as astronauts, including time in fighter jets, which put them in an environment where communication and coordination is essential — similar to spaceflight. After completing their flights, the crew were bestowed with special call signs that will adorn their flight suits. 

Having flown fighter jets many times before, Isaacman already had the call sign "Rook," and Inspiration4 representatives shared the rest of the crew's nicknames on Twitter. 

"Call signs acquired," the company tweeted on Aug. 10. "Introducing: Hanks, Leo, Rook, and Nova." 

Sembroski is "Hanks," Proctor is "Leo" and Arceneaux is "Nova". 

According to company representatives, the crew's family and friends were a part of the naming selection process as well as the crew themselves and their flight trainers. 

"By far one of the best parts of @inspiration4x #AstronautTraining is flying and even though our rocket will be going way faster - this gives us an opportunity to gain situational awareness in a complex, fast moving fighter jet," Proctor tweeted after the ceremony. 

If all goes as planned, "Hanks," "Leo," "Rook" and "Nova" will strap into their Dragon spacecraft on Sept. 15, and blast off on a three-day journey around the Earth. Liftoff is scheduled during a five-hour window that opens at 8:02 p.m. EST (0002 GMT on Sept. 16). 

Follow Amy Thompson on Twitter @astrogingersnap. Follow us on Twitter @Spacedotcom or Facebook.

Join our Space Forums to keep talking space on the latest missions, night sky and more! And if you have a news tip, correction or comment, let us know at:

Amy Thompson
Contributing Writer

Amy Thompson is a Florida-based space and science journalist, who joined as a contributing writer in 2015. She's passionate about all things space and is a huge science and science-fiction geek. Star Wars is her favorite fandom, with that sassy little droid, R2D2 being her favorite. She studied science at the University of Florida, earning a degree in microbiology. Her work has also been published in Newsweek, VICE, Smithsonian, and many more. Now she chases rockets, writing about launches, commercial space, space station science, and everything in between.