At sunset, the FIRST instrument is offloaded amidst a group of instruments from other research groups. A modified shipping container served as protective home for the instrument and interim office for the group of researchers who spent months making daily trips to the site. Supplemental oxygen helped ward off ailment -- and lack of focus -- sometimes associated with the altitude. Photo courtesy of Rich Cageao, NASA's Langley Research Center. Taken Aug. 3, 2009.