General John R. Allen, a retired U.S. Marine Corps four-star general and SEC-05-1 DKI APCSS alumnus, reflects on his experience at the Daniel K. Inouye Asia-Pacific Center for Security Studies. General Allen, who served as principal director for Asia and Pacific affairs in the Office of the Secretary of Defense, shares how the center influenced his career and deepened his understanding of regional security. He highlights the value of hands-on learning, international collaboration, and enduring professional networks fostered at DKI APCSS. This interview was part of the Daniel K. Inouye Speaker Series, “America’s Leadership in the 21st Century.”