Canadian vet told me up there they call it “Tanker’s Ear”
“Me too - USMC artillery in VN.”
Over 70% of my life a sound like a TV station “test pattern signal” has been constant companion. Occasionally “sumphin” causes the pitch of the “sound” to intensify for a brief period. Reckon in part it’s an occupational hazard for once being an 0341 mortar-man.
Your tag indicates service as an 0811, so I’ll say Thank You for perhaps having provided support on one occasion or the other. Weather being such in I-Corp, artillery was more readily available that CAS.
Semper Fi