Pierre Clostermann, French World War II ace, aviation executive, author and politician, died on March 22 in France. He was 85. Clostermann joined UK-based French Free Forces in 1942 and flew Supermarine Spitfires and Hawker Tempests during the war. After the war, he wrote a book on his combat duty and served as a member of the French parliament from 1946 to 1969. He later served as CEO of Reims Aviation and a v-p of Cessna.

William Rowe, former president and chairman of the Helicopter Association International (HAI), died on April 8. He was 81. Rowe became president of HAI in 1974 and served as board chairman from 1975 to 1976.

Neal Siller, a member of HAI and owner of Siller Brothers in Yuba City, Calif., died April 9. He was 70.