Official portrait of astronaut Pamela A. Melroy, pilot. Melroy will be commanding STS-120. The STS-120 mission will deliver the U.S. Node 2 module, named Harmony, aboard space shuttle Discovery to the International Space Station. Launch of Discovery on mission STS-120 is targeted for Oct. 23, 2007 at 11:38 a.m. EDT on a 14-day mission. This marks the first time an ISS expedition will be commanded by a woman. This also marks the first time the both commanders of the joint mission between ISS Expediton 16 and STS-120 will be women (Peggy Whitson, and Melroy, respectively) .