Tactical knives are also described as survival knives are knives intended for survival purposes in a wilderness environment, often in an emergency situation when the user has lost most of his/her main equipment. Military units issue some type of tactical knives to pilots in the event their plane may be shot down. Tactical knives can be used for trapping, skinning, wood cutting and other uses. Hunters, hikers, and outdoor sport enthusiasts use survival knives. Some tactical knives are heavy-bladed and thick; others are lightweight or fold in order to save weight and bulk as part of a larger survival kit. Their functions often include serving as a hunting knife.