This research project will investigate whether combat exposure under military deployment impacts individual time and risk preferences, i.e., discounting factor and risk attitudes. These two parameters are central in economic decision theory, which usually postulates that they are stable. Using survey data and administrative records collected for Danish soldiers deployed to the war zone in Afghanistan in 2011, the project provides an empirical test of this stability. The data are collected both before and after deployment. As current operations in Afghanistan are characterized by a high risk of improvised device and indirect fire, making war against the Taliban unpredictable, the project exploits this natural experiment that assigns combat randomly between similar combat troops units. Stability is investigated in a within-subject design comparing answers pre- and post-deployment, controlling for combat exposure both within and between units.