This tabletop exercise (summer 2026) will explore how severe food and water stress—identified by scientific and intelligence assessments as a likely inflection point in the early 2040s—could shape regional and global security dynamics. Bringing together researchers, practitioners, and senior decision-makers, the exercise places participants in leadership roles to navigate cascading shocks and compounding pressures on agriculture, water access, and political stability outside the United States. Participants confront second- and third-order effects including unrest, migration, interstate tensions, and resource competition, emphasizing long-term decision-making under uncertainty.