You've seen it in countless movies-- the soldier carrying his injured comrade off the battle field over his shoulder. Turns out that is exactly the wrong thing to do. Now, a Miamisburg company has patented an invention is says will make rescues much safer. Daytac -- a military and police tactical equipment research and development company -- has developed a new body armor that converts into a stretcher when necessary to safely transport injured military, police or firefighting personnel out of danger. The 10-ounce stretcher is flexible and fits into the bullet-proof vest worn by the rescuer until needed in an emergency. The company had six employees in early 2010, but expected to add two to four additional positions with expanded production.