Dr. Yung Kee Yeo honorably served the United States Air Force for more than 35 years. Since 1984, Dr. Yeo served as a Professor of Physics at the Air Force Institute of Technology where he taught and mentored Officers and Civilians across the Department of Defense for more than three decades. He directed the research of more than 50 fellows, faculty, and graduate students. The Science and Technology Community of the United States Air Force has benefited greatly from Dr. Yeo’s knowledge and insight. He will be missed.