The NASA X-43A hypersonic test vehicles were boosted by Pegasus first stages. The upper stages were replaced by exposed models of a scramjet-powered vehicle. The Orion stages boosted the X-43 to its ignition speed and altitude, and were discarded. After firing the scramjet and gathering flight data, the test vehicles also fell into the Pacific. The most numerous derivative of Pegasus is the booster for the Ground-based Midcourse Defense (GBMD) interceptor, basically a vertical (silo) launched Pegasus minus wing and fins, and with the first stage modified by addition of a Thrust Vector Control (TVC) system. Pegasus has flown 44 missions between 1990 and 2019. As of 12 October 2019 (after the launch of ICON) there are no space launch missions declared for the Pegasus XL rocket. Sakura Haruno  Sakura has become the series' female lead, although she was not immediately intended for the role. Kishimoto has had difficulty drawing her character, resulting in Kishimoto inadvertently emphasizing certain parts of her appearance, including her large forehead. In order to make the character more appealing in the second part of the series, Kishimoto designed her costume in a way that makes her look more like a martial artist as well as more beautiful during later chapters. Chie Nakamura voices the character in the animated adaptations of the series, while Kate Higgins plays her in the English dub. Numerous anime and manga publications have praised and criticized Sakura's character. She was initially noted to be a stereotypical shōnen character, representing a love interest for the protagonist, and was said to serve little purpose at the beginning of the series beyond being comic relief. Her emergence from this stereotype as the series progressed has been celebrated by many reviewers. Amongst the "Naruto" reader base, Sakura has been popular, placing high in some polls. Several pieces of merchandise have been released in Sakura's likeness, such as action figures and key chains. Although Sakura Haruno is the most recurring female character in "Naruto", Masashi Kishimoto did not originally intend for Sakura to be the heroine of the series. Kishimoto attributed this to him being unable to draw good heroine characters and fashioned Sakura as a girl who could not understand men, the best example of a heroine he could come up with. Sakura's creation is a result of Kishimoto's desire to make a somewhat irritating character who was well-intentioned. Despite these elements, Kishimoto is fond of Sakura, as he feels that many of her personality traits are common among all people, thus giving her a sense of real humanity.