When Gen. Joseph Hooker took command of the Army of the Potomac on 27 January 1863, he immediately saw the need for an effective centralized intelligence system. On 11 February, Col. George H. Sharpe, an attorney and an officer of New York state volunteers, accepted the post of head of the Army's intelligence service. Under Sharpe, with direction from Hooker, the Bureau of Military Information (BMI) was created. Its sole focus was collection of intelligence on the enemy; it had no counterintelligence responsibilities. It soon developed into the first "all-source intelligence" organization in US history. Sharpe obtained, collated, analyzed, and provided reports based on scouting, spying behind enemy lines, interrogations, cavalry reconnaissance, balloon observation, Signal Corps observation, flag signal and telegraph intercepts, captured Confederate documents and mail, southern newspapers, and intelligence reporting from subordinate military units. This structured approach, which ended with the Confederate surrender, was not re-institutionalized until 1947, when the CIA was created.