For a number of years the military has been testing and evaluating a device called AID (Automatic Injury Detection). This system consists of a thin, lightweight plastic sheet, much like "Saran Wrap". The sheet has a conductive ink on it that, when pierced by shrapnel or a bullet, activates a signal which is sent via battlefield networks, to the appropriate Commander, medical personnel and transport assets. It not only alerts the network that a casualty has occurred, but advises the Commander that contact with the enemy has occurred. The message contains location of the event and can be augmented with medical data about the patient. The message is sent automatically, with no need for human input.
AID has been successfully in use with dozens of police forces, border patrol elements and others for years. It greatly reduces reporting delays, facilitates rescue, and enhances the "Golden Hour".