The 15th Department of Defense (DoD) Electro-Magnetic Windows Symposium (EMWS) supports the unique mission of DoD and the Services in the area of electro-optic and radar window and dome materials and design. It brings together members of an interdisciplinary community across government, industry and academic institutions to: increase awareness around the DoD’s objectives, initiatives and opportunities in the area of electro-magnetic windows; present electro-magnetic window technical challenges, discuss possible solutions and find new performers; and learn and share feedback on basic research, new ideas and innovations.