National Commission on United States Involvement in Afghanistan Act of 2021 This bill establishes the independent National Commission on United States Involvement in Afghanistan. The commission shall assess and report on issues related to U.S. involvement in Afghanistan since 2001, specifically (1) U.S. strategic goals and interests and whether such goals were achieved, (2) U.S. assessments of the situation and whether those assessments were accurately communicated to policymakers and the public, (3) efforts by the United States and its allies to withdraw from Afghanistan, (4) U.S. efforts to evacuate U.S. citizens and Afghan allies, and (5) recommendations for corrective measures for future foreign policy endeavors. The commission terminates 60 days after submitting its final report to Congress.