Introduction to the Special Issue on Moral Injury: Conceptual Challenges, Methodological Issues, and Clinical Applications.

This article introduces a special issue of the Journal of Traumatic Stress devoted to new directions in the study of moral injury (MI), defined as transgressive harms and the outcomes of those experiences. Although a significant body of research has emerged devoted to the study of the MI construct, a number of conceptual and empirical challenges have arisen; these are summarized and discussed in the present article. In addition, this article proposes ways of overcoming these challenges in order to further research and clinical practice in the field. We then go on to introduce the content and themes of the present collection of articles in this special issue, all of which provide examples of some of the most innovative and forward-looking work on the topic and expand into new conceptual frameworks, new methods of investigation, and new populations and contexts.