Summary
Vietnam-era SDU-5/E distress marker strobe for US forces. Clear and blue flash guard modes.
Description
how to use it (place it, look at it, switch on/off, fit blue flash guard; it’s in the US arsenal).

Vietnam-era SDU-5/E distress marker strobe for US forces. Clear and blue flash guard modes.
how to use it (place it, look at it, switch on/off, fit blue flash guard; it’s in the US arsenal).