Lt. Col. Donald Klinko joined the Air Force in 1972 as a security police officer. More than 30 years later, the colonel, now a reservist with the 507th Air Refueling Wing, has maintained his proficiency in the career field and has twice joined security forces fly-away teams to forward-deployed locations in Afghanistan for Operation Enduring Freedom. He retires this month with 33 years of service. (U.S. Air Force photo by Senior Airman Matt Rosine)