“These men were not professional photographers, but they were professional observers, recorders, and interpreters of scientific phenomena, as well as human beings appreciative of natural beauty. Thus, [their] photographs represent a combination of scientific and esthetic interests. Each of the flight crews was selected for a particular mission several months before the flight and underwent rigorous specific-mission training during the period between selection and launch. The training included not only instruction and practice in the use of the cameras and film but also briefings on the scientific background and purpose of the photographic experiments planned for that particular flight, in addition to the engineering and pilot training required for the mission. [...] The photography obtained in the Gemini program will stand as a lasting tribute to the flight crews’ abilities and interest.”

—Robert Gilruth, NASA Manned Spacecraft Center Director (NASA SP-171, pg. 257)