Actually, in some cases, use of the mini- biscuit gun was indicated. Possible no radio at the field or maybe inop. Or, as Hugh mentions, security.  I hhadone of these when I was a CAP cadet in the mid 50s.  I may still have, someplace, an "Airfield Signal Lamp". It looks to be a 1940's style headlight with a pistol grip and trigger installed. 
Jeep K3HVG
On 01/17/2023 11:08 PM Hubert Miller <[email protected]> wrote:


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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