War
Article on the ethics of war and peace, the Just War theory, and pacificsm. From the Stanford Encyclopedia, by Brian D. Orend.

The Moral and Ethical Challenges of Modern War
Speech by Anthony Cordesman at the U.S. Army War College [pdf].

BBC Religion & Ethics: Ethics of War
Explains the fundamental ethical problems of warfare: the doctrine of just war, pacifism, and religious views of war.

Military Ethics
Videos of lectures, links for resources and problems for case studies.

Abelard - The Just War
Short paper discussing the notion of 'just war' in historic context and with reference to current affairs (2002).

Carnegie Council - Ethics and the Use of Force Program
Promotes research and discourse on the role of ethics in armed conflict.