Y36.47 - War operations involving unintentional restriction of air and airway Y36.4 - War operations involving firearm discharge and other forms of conventional warfare Y36.47 - War operations involving unintentional restriction of air and airway Y36.470 - War operations involving unintentional restriction of air and airway, military personnel Y36.471 - War operations involving unintentional restriction of air and airway, civilian