Winnefeld Speaks at Defense Programs Conference in Washington, D.C. Navy Adm. James A. Winnefeld Jr., vice chairman of the Joint Chiefs of Staff, speaks to attendees of the McAleese/Credit Suisse defense programs conference at the Newseum in Washington, D.C., March 17, 2015. Winnefeld discussed several topics, including operational challenges, combatant commanders' requirements and concerns of the tactical warfighter. SHARE: Download: Full Size (0.04 MB) Credit: VIRIN: 768992-K-ACY99-221.jpg Photo Gallery