Navy commissioned him as an ensign shortly after his graduation. He advanced to lieutenant junior grade in 1931 while serving aboard the new aircraft carrier , where he worked in radio communications—a technology then still in its earlier stages. The captain of this carrier, Ernest J. King, later served as the Chief of Naval Operations and Commander-in-Chief, U.S. Fleet during World War II. Military historians frequently interviewed Heinlein during his later years and asked him about Captain King and his service as the commander of the U.S. Navy's first modern aircraft carrier. Heinlein also served as gunnery officer aboard the destroyer in 1933 and 1934, reaching the rank of lieutenant. His brother, Lawrence Heinlein, served in the U.S. Army, the U.S. Air Force, and the Missouri National Guard, reaching the rank of major general in the National Guard. Marriages In 1929, Heinlein married Elinor Curry of Kansas City. However, their marriage lasted only about a year. His second marriage in 1932 to Leslyn MacDonald (1904–1981) lasted for 15 years. MacDonald was, according to the testimony of Heinlein's Navy friend, Rear Admiral Cal Laning, "astonishingly intelligent, widely read, and extremely liberal, though a registered Republican", while Isaac Asimov later recalled that Heinlein was, at the time, "a flaming liberal". (See section: Politics of Robert Heinlein.) At the Philadelphia Naval Shipyard Heinlein met and befriended a chemical engineer named Virginia "Ginny" Gerstenfeld. After the war, her engagement having fallen through, she attended UCLA for doctoral studies in chemistry, and while there reconnected with Heinlein. As his second wife's alcoholism gradually spun out of control, Heinlein moved out and the couple filed for divorce. Heinlein's friendship with Virginia turned into a relationship and on October 21, 1948—shortly after the decree nisi came through—they married in the town of Raton, New Mexico, shortly after setting up housekeeping in the Broadmoor district of Colorado Springs in a house that Heinlein and his wife (both engineers) designed. As the area was newly developed, they were allowed to choose their own house number, 1776 Mesa Avenue. The design of the house was featured in Popular Mechanics. They remained married until Heinlein's death. In 1965, after various chronic health problems of Virginia's were traced back to altitude sickness, they moved to Santa Cruz, California, which is at sea level. Robert and Virginia designed and built a new residence, circular in shape, in the adjacent village of Bonny Doon.