Description
The US/C-3 was developed during World War II as a response for secure nighttime signaling. In conjunction with RCA, the Navy developed a method: the use of infrared light. Aldis lamps, spotlights, and beacons could be filtered through glass to only emit infrared light. Such tools could be used by covert operations to help guide vessels to landing sites, or transmit signals covertly. Not being within the range of visible light, detection could be kept to a minimum.
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