The equipment in the image shows two types of mil-scale reticles: the M19 and the M3A. These reticles are used in scopes or riflescopes to estimate target distance. How to Use a Mil-Scale Reticle Mil-scale reticles operate on the principle of milliradians (mils), a unit of angular measurement. One milliradian is equal to 1/1000 of the object distance, meaning 1 milliradian is equivalent to 1 meter at 1,000 meters or 1 yard at 1,000 yards #usa #ww2 #Army | Combat World Army.