“The world breaks everyone and afterward many are strong
at the broken places.” 

— Ernest Hemingway
A Farewell to Arms (1929)

Introduction: The Changing Character of War

U.S. national defense readiness has traditionally emphasized warrior lethality through physical conditioning, marksmanship, and the combat proficiencies needed for conventional war. These skills remain essential, but they are no longer sufficient. The character of war has changed in ways that place growing strain not only on platforms and formations, but on the cognitive, moral, and psychological endurance of those who fight. Boundaries that once separated peace from conflict, civilian from combatant, and the front line from the home front have increasingly blurred, creating new demands for force readiness and national defense.

Hybrid warfare, as used in this chapter, refers to the integrated and sustained employment of military and non-military means—including conventional combat, cyber operations, economic coercion, information manipulation, and attacks on critical infrastructure—within a continuous campaign directed not only against opposing forces, but against the broader fabric of society. Hybrid warfare aims to erode morale, fracture cohesion, and exhaust the cognitive and emotional capacity of soldiers, institutions, and populations over time. In this environment, the ability to withstand pressure, maintain clarity, and act with integrity becomes an individual, organizational, and strategic necessity.

The war in Ukraine makes this transformation unmistakable. While it is Europe’s largest conventional conflict since World War II, its decisive pressures extend far beyond long-range fires and maneuver. Daily missile strikes on civilian areas, systematic attacks on energy and communications infrastructure, disinformation campaigns targeting soldiers’ families, and cyberattacks on hospitals and power grids have produced conditions of chronic uncertainty and threat. Scholars describe this environment as continuous traumatic stress (CTS): persistent exposure to real and ongoing threat, with no clear boundary between “before,” “during,” and “after” danger.

In Ukraine, resilience capabilities originally designed for deployed forces have become indispensable not only for soldiers in trenches, but for teachers, nurses, parents, and entire communities living under bombardment and displacement. Ukraine’s experience demonstrates that resilience is no longer solely a military concern; it has become a matter of national security.

This chapter examines how the concept of warrior ethos must evolve to meet the realities of machine-speed warfare and the societal vulnerabilities posed by hybrid warfare. It draws on research in resilience and post-traumatic growth, as well as two decades of U.S. military human performance initiatives, including Preservation of the Force and Family (POTFF), Holistic Health and Fitness (H2F), and Total Force Fitness (TFF), to explore how warriors sustain ethical judgment, cohesion, and purpose under prolonged pressure. Within this framework, the chapter considers fortitude as an integrating concept that connects resilience, growth, and moral endurance in the context of hybrid warfare. The future of deterrence depends on strengthening the cognitive, psychological, moral, and ethical foundations of individuals, the force, and society.

https://doi.org/10.71236/k6xqwmpc