What wars led the U.S.military to institute changes based on a counterinsurgency emphasis?

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The U.S. military implemented changes based on a counterinsurgency emphasis in response to the wars in Afghanistan and Iraq. These conflicts were marked by insurgent warfare tactics and required new approaches to effectively combat and stabilize the regions. The military's focus on counterinsurgency operations during these wars resulted in doctrinal changes, the development of new strategies, and the adoption of new technologies and training methods. The other options listed (A, B, and C) did not have as significant an impact on the military's approach to counterinsurgency warfare.

What Wars Led the U