[ARC5] One use of light gun at airfield

[Hubert Miller]

Here is something that kind of puzzles me. Every long flight in any aircraft was provided with a list of frequencies of navigation aids
and airfield frequencies. But here is a C-47 coming in to Panama Canal Zone field, and the pilot uses a light gun to signal. Was this 
from some misguided fear of enemies listening? 
-Hue Miller 
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