George Washington's military career provided crucial lessons that shaped his leadership style. His experiences during the French and Indian War taught him the importance of strategic planning and the value of collaboration with allies. Washington learned to adapt tactics based on battlefield conditions, which proved vital in the American Revolution. Additionally, his relationships with fellow officers highlighted the necessity of moral integrity and unity. These insights not only formed his military strategies but also influenced his vision for American leadership, emphasizing democracy and the well-being of the nation over personal ambition.