A Christian Science perspective.
Figures from the National Center for PTSD (post-traumatic stress disorder) indicate that "about 12% to 20% of soldiers and Marines had PTSD after serving in Iraq. About 6% to 11% of soldiers had PTSD after serving in Afghanistan." PTSD is an anxiety disorder that can develop after someone has been through a traumatic event, for example, seeing others killed in battle. Even after a soldier returns to civilian life, a sharp sound may arouse those stressful memories and make him or her feel under attack or out of control.
Soldiers are sometimes reluctant to ask for help because they don't want to be seen as weak. But our prayers can reach out to them, affirming their true strength as the sons and daughters of God. The Old Testament tells of many military encounters, and the life of King David provides some good examples of courage under stress. David is well known for his success against Goliath when he was only a young man, and then he went on to command his own army in battle.