Air Force graduates its largest class of female test pilots and engineers in history

The women of class 2020A of the US Air Force Test Pilot School at Edwards Air Force Base.

(CNN)They soar into the desert skies, piloting some of the most sophisticated aircraft the world has ever seen. They have an innate understanding of high-performance aircraft and are always pushing the boundaries on performance.

They are the small cadre of flight test pilots who graduate from the US Air Force Test Pilot School (TPS) at Edwards Air Force Base in California -- and this year they include a group of five women, a record number.
For the five already dominating the skies, it's no big deal and they just wonder why there aren't more females doing it.
      Known by their call signs -- Hulk, Tumble, Booster, PsiPhi and Shade -- Capts. Casey Horgan, Rachel Williams, Sarah Vorgert, Kalyn Tung and civilian Raina Duncan are the newest female flight test pilots and engineers to graduate from TPS.
        "There was never anything I was told I couldn't or shouldn't do," Horgan said. "I grew up with great examples of female aviators, my mom included, and all of her friends and there was no barrier there."
          Flight test involves the Air Force's top pilots, engineers and combat systems operators working to develop and test the newest technology needed to maintain and improve aircraft flying qualities and performance.
          Technical Director David Vanhoy said TPS graduates are trained to have a disciplined tester's mindset to improve the Air Force's aircraft capabilities.
          Jet trails streak the sky over the Mojave Desert at night.
          The five women graduated in a class of 24 students. The average number of women per class is usually one to two, according to Vanhoy.
          Their class photo will share a wall with TPS graduates and aviation legends Gen. Chuck Yeager and Apollo 11 astronaut Buzz Aldrin. Years after completing the program, each man returned to the school to serve as its commander. They helped to establish the developmental curriculum and disciplined ethos the school still uses today.
          The world's most famous test pilot, Yeager, passed away this month at the age of 97. He was the first man to fly faster than the speed of sound, and broke his own record by flying twice as fast as the speed of sound. Current students and instructors have the same barrier-breaking mentality as they push the envelope of flight tests, putting themselves at great risk every day.

          Meet the women of Class 2020a

          Edwards' TPS is the only Air Force test pilot school and is located at the world's leading aeronautical test facility. Based in the Mojave Desert, jets of all speeds and sizes can be seen flying above miles of dry lake bed, and felt throughout the day each time a sonic boom pulses over the surrounding valley.
          The school only accepts 45 of the "best and the brightest" pilots and engineers per year -- divided into 2 classes -- for the rigorous year-long master's degree program. Out of a pool of around 250-300 applicants, usually less than 10% of the applicants are women, Vanhoy said.
          Capt.Casey Horgan
          Capt. Rachel Williams
          Capt. Sarah Vorgert
          Capt. Kalyn Tung
          Raina Duncan
          This year, women made up roughly 20% of the 2020A class:
          Capt. Casey "Hulk' Horgan, test pilot. Age 31, Horgan flew C-130 Hercules transport aircraft at Eglin Air Force Base in Florida before attending TPS. Both of her parents were Air Force aviators and she knew she wanted to fly since she was a child.
          Capt. Rachel "Tumble" Williams, test pilot. Age 29, she attended the Massachusetts Institute of Technology and flew C-17 Globemaster cargo aircraft in Texas before getting into TPS. She grew up near the Kennedy Space Center in Florida and watched shuttle rocket launches from her driveway growing up. Her father was an Air Force pilot.
          Capt. Sarah "Booster" Vorgert, flight test engineer. Age 27, worked as a weapons tester at Eglin Air Force Base in Florida before going to TPS. She is one of the youngest students to be accepted into the school and started going to air shows as a toddler.
          Capt. Kalyn "PsiPhi" Tung, flight test engineer. Age 30, she graduated from the US Air Force Academy and stayed to teach there. She thought airplanes were cool and had a female teacher she looked up to who graduated from TPS, which made her want to pursue a career in flight test.
          Raina "Shade" Duncan, civilian flight test engineer. Age 35, she worked at Edwards Air Force Base for 11 years on the flight line and on T-7 jet trainers before she was accepted into TPS. The mother of a 2-year-old daughter, she attended her first air show when she was 3 years old.

          Do the barriers really exist?

          Sitting around a conference table at TPS two nights before graduation, the women talked humbly about the significance of what they have accomplished.
          They're part of a community of female aviators who are considered barrier breakers, but their biggest question is why aren't more women doing what they're doing. When asked why it's important to see more women in the cockpit and involved in aviation in general, the unanimous sentiment was best expressed by Horgan: "Because there's no reason not to."
          "We don't get it," Williams said. "Because I personally haven't experienced any barriers to getting here because of being a woman. It was something I wanted to do -- so I did it. That's where we all are so we're really like, 'Where's everybody else?'"
          Horgan and Williams, the two pilots of the group, had the advantage of having parents in the Air Force. Both pilots agreed that access and visibility played a huge part in piquing their interest as children.
          Vorgert, the youngest in the group and one of the youngest students to attend TPS, noted that changes are being made to barriers women have faced in the past.
          "There's a certain standing and sitting height requirement that females don't meet -- because we're not the average 1970s male," she explained. "But they've been going through the decades-old requirements and starting to open them up to more demographics."

          Defying expectations