Jack Keane retired from the United States Army in 2003, as a general and Vice Chief of Staff of the Army. He had been U.S. Secretary of Defense Donald Rumsfeld's choice to replace GEN Eric Shinseki as Chief of Staff of the Army in 2003, had retired instead, needing to care for a sick wife. He stayed involved as a member of the Defense Policy Board and an ABC News analyst, and, along with other retired generals, continued to visit Iraq.
Immediately after retirement,he became currently President GSI, LLC, is senior advisor to Kohlberg Kravis Roberts & Co. and advisor to Chairman and CEO, URS Corporation. He is a director of METLIFE, Inc and General Dynamics Corporation.
He is a member of the board of the Center for Strategic and Budgetary Assessments, the Congressional Commission on the National Guard and Reserves, a member of the Council on Foreign Relations, director of the George C. Marshall Foundation, chairman of Senior Executive Committee, Army Aviation Association of America.
In August, his wife found him sitting in the dark, reflecting that the U.S. was about to lose its first war since Vietnam. He decided he had to speak out, and went to visit Rumsfeld on 19 September, concluding the political and military strategy in Iraq was becoming catastrophic. 
In the summer of 2002, he visited the Guantanamo Bay detention camp and found the quality of intelligence gathered unsatisfactory finding "... the police are guarding the detainees, and the interrogators are trying to get information out of them, and the two never work together towards common objectives." unified command. 
Vice Chief of Staff
As VCSA, he was Chief Operating Officer of the United States Army, he managed operations of more than 1.5 million soldiers and civilians in over 120 countries and an annual budget in excess of $110 billion dollars.
General Keane was a career paratrooper who commanded at every level to include the XVIII Airborne Corps; the 101st Airborne Division and the Joint Readiness Training Center. He also served as the Deputy Commander-in-Chief of the United States Atlantic Command (now United States Joint Forces Command)
He was a platoon and company commander in the Vietnam War. His units deployed to Somalia, Haiti, Bosnia and Kosovo.
- Fordham University business school in 1966 with a Bachelor of Science Degree in Accounting
- a Masters of Arts Degree in Philosophy from Western Kentucky University. His military education *Infantry Officers Basic and Advanced Courses,
- United States Army Command and General Staff College
- United States Army War College.
General Keane's Army awards and decorations include: two Defense Distinguished Service Medals, two Army Distinguished Service Medals, the Silver Star, five Legions of Merit, the Bronze Star Medal, the Ranger Tab, the Combat Infantryman's Badge, the Master Parachutist Badge, and the Air Assault Badge.
- Linda Robinson (2009), Tell Me How This Ends: General David Petraeus an the Search for a Way out of Iraq, Public Affairs, ISBN 9781586465283, pp. 30-31
- The Torture Question: Interview, Jack Keane, Public Broadcasting Service