The Eisenhowers had two sons. Doud Dwight "Icky" Eisenhower was born September 24, 1917, and died of scarlet fever on January 2, 1921, at the age of three; Eisenhower was mostly reticent to discuss his death. Their second son, John Eisenhower (1922–2013), was born in Denver Colorado. John served in the United States Army, retired as a brigadier general, became an author and served as U.S. Ambassador to Belgium from 1969 to 1971. Coincidentally, John graduated from West Point on D-Day, June 6, 1944. He married Barbara Jean Thompson on June 10, 1947. John and Barbara had four children: David, Barbara Ann, Susan Elaine and Mary Jean. David, after whom Camp David is named, married Richard Nixon's daughter Julie in 1968. John died on December 21, 2013.