Scholars have argued that the end of the Cold War and the War on Terror have radically changed the context of war and defense, diminished the role of nation-states in favor of multi-lateral defense activities, and placed a new focus on human security. International peacekeeping has superseded
the traditional act of war-making as the most important defense strategy among wealthy, liberal-democratic nations. And, per UN Security Council Resolution 1325, adopted in 2000, all member nations must consider the needs of women and girls during repatriation, resettlement, and post-conflict
reconstruction efforts.

Gender, Sex, and the Postnational Defense looks at the way that a postnational defense influenced by SC 1325 and focused on human security affects gender relations in militaries. Interestingly, despite the successful implementation of gender mainstreaming in training, the number of women involved in
military peacekeeping remains low. Contradicting much of the gender mainstreaming literature, Annica Kronsell shows that increasing gender awareness in the military is a more achievable task than increasing gender parity.

Employing a feminist constructivist institutional approach, Kronsell questions whether military institutions can ever attain gender neutrality without confronting their reliance on masculinity constructs. She further questions whether feminism must always be equated with anti-militarism or if
military violence committed in the name of enhancing human security can be performed according to a feminist ethics. Kronsell builds her theoretical argument on a case study of Sweden and the E.U.