Article: On February 18, 1966, Kerry enlisted in the Naval Reserve. He began his active duty military service on August 19, 1966. After completing 16 weeks of Officer Candidate School at the U.S. Naval Training Center in Newport, Rhode Island, Kerry received his officer's commission on December 16, 1966. During the 2004 election, Kerry posted his military records at his website, and permitted reporters to inspect his medical records. In 2005, Kerry released his military and medical records to the representatives of three news organizations, but has not authorized full public access to those records.

Question: When did Kerry become a navy officer?
December 16, 1966