To mark the fifteenth anniversary of the 9/11 attacks, the Center for Homeland Defense and Security is publishing three reflective essays by distinguished affiliated practitioners and academics. Joe Pfeifer is a graduate of the CHDS master’s degree program and is an Assistant Chief at FDNY. Cathy Lanier is also a graduate of the CHDS master’s degree program and is currently Chief of the Washington D.C. Metropolitan Police Department. Dr. Rodrigo Nieto-Gomez is a research professor and futurist at the National Security Affairs Department and at the Center for Homeland Defense and Security at the Naval Postgraduate School.