Dr. Steph Hinnershitz is an Assistant Professor of Security and Military Studies at the Air Command and Staff College at Maxwell Air Force Base and a fellow with the  National World War II Museum. She discusses D-Day, the largest amphibious invasion in military history, and highlights the multinational nature of the operation, with significant contributions from the British and Canadians. She also discusses the strategic planning and coordination required for the invasion, including dealing with unpredictable factors like weather and human responses.