[Untitled photo, possibly related to: Carlisle, Pennsylvania. Demonstration before army doctors and officer candidates at the U.S. Army field service school. Three company aid men (i.e. unarmed medical soldiers), are attached to each infantry company as well as to other fighting units, and move with them into the thick of battle. When a wounded man falls, he administers first aid, and puts a tag on his bayonet for the litter bearers to find]. Sourced from the Library of Congress.