Why is everyone surprised that leper enlists in the military?

Everyone is surprised that Leper enlists in the military because he is seen as an outsider and a pacifist within the group of boys at Devon School. His shy and introspective nature, combined with his appreciation for nature and aversion to conflict, makes his decision to join the army unexpected. Additionally, the pressure of societal expectations and the realities of war contrast sharply with his character, leading to disbelief among his peers. This decision highlights the theme of the struggle between individual identity and societal norms.