David Yorck was born in Germany during World War II and came to the United States in 1950. After joining the U.S. Marine Corps, he was immediately sent to Vietnam for the first of multiple tours. He would serve there as a platoon commander, company commander, and in an intelligence role.

In this edition of "Veterans Chronicles," Col. Yorck walks us through the horrors of combat, his frustrations with the system, and how his role changed with greater responsibility. He also tells us about the Marine who helped him most in Vietnam and remains his best friend to this day and takes inside Operation Phoenix, a mission to identify and root out communists in South Vietnam.

Finally, Col. Yorck discusses his extensive work with the Military Officers Association of America, an organization he has served faithfully for decades.