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Emergency Signaling Mirror, Mark 3

The signaling mirrors are intended to attract the attention of search and rescue parties, when in an emergency situation.

emergency signaling mirror, type I of MIL-M-18371EType I of MIL-M-18371E


The signaling mirrors shall consist of two layers of the glass, laminated together, with a see-through sighting device in the center and a lanyard on one corner.


When used in daytime and with good visibility, a mirror flash can be seen at a distance of 30 miles at an altitude of 10,000 feet. Though less effective, and with possible shorter range, mirror flashes can also be seen on cloudy days with limited visibility. To use the mirror, proceed as follows:

  1. Hold mirror in a manner which will allow the sunlight to reflect on a nearby surface such as the hand or other close object.
  2. Bring mirror up to eye level and using one eye, look through the sighting device until an intense bright spot is located. This is the aim indicator.
  3. Hold the mirror close to the eye and slowly turn it until the bright spot is on the target.



  • Type I, 2 x 3 in.
    • acrylic mirror: 6350-105-1252 (assigned at 1968-07-03), converted to 6350-00-105-1252
    • glass mirror: 6350-01-455-6671 (assigned at 1998-05-11)
  • Type II, 3 x 5 in.
    • acrylic mirror: 6350-261-9772 (assigned at 1963-01-01), converted to 6350-00-261-9772
    • glass mirror: 6350-01-455-6695 (assigned at 1998-05-11)