to a pale blue, light blue, greenish blue, and medium blue. The outer bands of black and dark blue represent five months of Antarctic darkness; the center portion, by its size and colors – grading from medium blue through light blue and pale blue to white – symbolizes seven months of solar illumination, and also the aurora australis. Devices For those personnel performing extended winter service in Antarctica, a "Wintered Over" device is authorized. The "Wintered Over" bar is only worn on the full-size medal's suspension ribbon. The smaller "disc" device is worn on the uniform ribbon to recognize this service. The Wintered Over device is bestowed to indicate the number of winters served on the Antarctica continent. The device is worn as a disk on the award ribbon and is issued in bronze for one winter service, gold for two, and silver for three or more winters of service. On the full-sized medal a clasp is worn, issued in the same degree, inscribed with the words "Wintered Over". Partial list of notable recipients Delbert Black Fredrik Th. Bolin Eugene L. Boudette Erroll M. Brown William A. Cassidy Nancy Chabot Richard H. Cruzen Bill Curtsinger Robert L. Dale Merton Davies David Drewry Howell M. Estes II Linda L. Fagan Joseph D. Healy Kelly Jemison Christina Koch Otto Ludwig Lange Wesley L. McDonald Michelle Rogan-Finnemore Christine Siddoway Martin Sponholz Paul Tasch Carlisle Trost Dean Winslow References External links 1960 establishments in the United States Awards established in 1960 Awards for polar exploration Military awards and decorations of the United States Military in Antarctica United States Antarctic Program