The VS-17 is a signaling device used by military personnel to send signals to aircraft, and to mark improvised landing sites. The VS-21 is a replacement for the VS-17 that provides an infrared signature, allowing use in low visibility conditions via thermal imaging.
The VS-17 is a signaling device used by military personnel to send signals to aircraft, and to mark improvised landing sites. The VS-21 is a replacement for the VS-17 that provides an infrared signature, allowing use in low visibility conditions via thermal imaging.
Source: Wikipedia "VS-17" · CC BY-SA 4.0
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