Cinnamon (YN-69) was launched 6 June 1943 as Royal Palm by Pollock-Stockton Shipbuilding Company, Stockton, California; sponsored by Mrs. E. R. Ward; renamed Cinnamon 7 December 1943; and commissioned 10 January 1944. She was reclassified AN-50 on 20 January 1944.
Departing San Diego, California, 6 April 1944, Cinnamon arrived at Milne Bay, New Guinea, 18 May. She supported operations in the New Guinea area until 17 January 1945 when she sailed to Manus and the Philippines, where she remained until 17 November.
She sailed for San Francisco, California, arriving 22 December, and from 8 January to 15 November 1946, Cinnamon operated under Commandant, 11th Naval District out of San Pedro, California. Arriving at Pearl Harbor 25 November 1946, she departed 21 January 1947 and sailed via Wake Island and Guam to Shanghai, arriving 15 March.
Cinnamon was decommissioned 25 March 1947 and transferred to Nationalist China through the U.S. State Department.
Cinnamon was awarded one battle star for service in World War II.