At the request of President Franklin D. Roosevelt, Byrd took command of the U.S. Antarctic service and led a third expedition to Antarctica in 1939–41, this one financed and sponsored by the U.S. government. Bases were located at Little America and Stonington Island, off the Antarctic Peninsula. Byrd’s discovery of Thurston Island greatly decreased the length of unexplored coast of the continent.
During World War II Byrd served on the staff of the chief of naval operations and, among other duties, evaluated Pacific islands as operational sites. After World War II Byrd was placed in charge of the U.S. Navy’s Operation High Jump. This Antarctic expedition, his fourth, was the largest and most ambitious exploration of that continent yet attempted and involved 4,700 men, 13 ships (including an aircraft carrier), and 25 airplanes. Operation High Jump’s ship- and land-based aircraft mapped and photographed some 537,000 square miles (1,390,000 square km) of the Antarctic coastline and interior, much of it never seen before. Byrd flew into Little America from the deck of the aircraft carrier Philippine Sea north of the ice pack, about 700 miles (1,100 km) from the camp. He made a second flight over the South Pole and took part in several other flights.
In 1955 Byrd was made officer in charge of the United States’ Antarctic programs and became the senior authority for government Antarctic matters. In this capacity he helped supervise Operation Deep Freeze, a major scientific and exploratory expedition sent to the Antarctic under navy auspices as part of the program of the International Geophysical Year (1957–58). Byrd accompanied the expedition aboard the icebreaker Glacier and took his last exploratory flight over the South Pole on January 8, 1956.
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