Scholars have argued for decades about the relationship between biological sex and organized violence, but feminist analysts across numerous disciplines have documented the range and variety of gendered roles in times of war. In recent years, research has brought new understanding of the rapidity with which ideas about masculinity and femininity can change in times of war and the role of militarization in constructing and enforcing the meaning of manhood and womanhood. In the post–Cold War period, “new wars” (Kaldor 1999) have mobilized gender in multiple ways, and peace-building is often managed by external humanitarian organizations. A strange disconnect exists between the massive body of scholarly research on gender, militarism, and peace-building and on-the-ground practices in post-conflict societies, where essentialized ideas of men as perpetrators of violence and women as victims continue to guide much program design.