What date did NATO leaders sign off on President Obama's exit strategy from Afghanistan?

The correct date when NATO leaders signed off on President Obama's exit strategy from Afghanistan is significant as it marks the formal endorsement of a timeline for the withdrawal of U.S. and coalition forces. This occurred during a NATO summit in Chicago on May 21, 2012, where President Obama presented the plan for transitioning security responsibilities to Afghan forces.

Understanding this date is crucial as it reflects NATO's commitment to collective defense and its role in the mission in Afghanistan. The summit was pivotal in setting clear expectations for the withdrawal and planning for Afghanistan's future security. The other dates do not correspond to the time when NATO formalized the exit strategy; instead, they involve other developments in the timeline of the Afghanistan mission, such as operational draws or milestones that occurred later.