ID-866 Status Indicator Box

---

The ID-866 was a red/black indicator lamp assembly that was mounted inside the Crypto Operations area and controlled from the outside.  When an unclassified but authorized visitor requested entrance, the security guard would flip the switch and change the status to "Caution Unclassified".  This told all the operators to cover the machines, codebooks, papers and anything else that was classified before the visitor entered.  Each lampholder holds a, small, screw-in lamp. Both lamps are wired to the secondary output of a stepdown transformer within the enclosure. The primary of the transformer is  fused.

ID-866 front view.

ID-866 side view.

Both photos via E-bay

---

Contributors and Credits:

1) David Turner, CIV NAS Oceana, N3 <david.p.turner1(at)navy.mil>

Oct 6/11