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.
David's psalms sometimes refer to the fear he may have felt in war. But God was always his strong helper and comfort. He wrote: "Be merciful unto me, O God: for man would swallow me up; he fighting daily oppresseth me.... What time I am afraid, I will trust in thee" (Ps. 56:1, 3).
His conviction that God was with him – and with his people – is evident in the book of Psalms and ranges from times when he was feeling low to periods when his certainty of God's love was unshakable. The psalms are a valuable resource for anyone dealing with PTSD or any other mental ailment.
But it's possible to go further – to actually seek healing. Jesus was never a soldier as David was. Yet his consciousness of God's love gave him remarkable spiritual authority – and people felt this. For example, at one point, a centurion – a soldier in the Roman Army – asked Jesus to heal a dearly loved servant who was sick.