We were doing tank tactics training in Louisiana. At night, we would set the tanks up into defensive positions and just sit there. We had FO (Forward Observers) out so they could alert us if anyone tried to sneak into our perimeter. There was no one out there and it was really boring.
The Colonel, our battalion commander had declared radio listening silence. We were only to use the radio if we had enemy contact.
Around 2:00 a.m. one of the tank commanders couldn't stand the boredom. He keyed his radio and said,
"Are there any friendly bears out there?"
A reply came, "I'm a friendly bear."
Then another, "I'm a friendly bear too!"
The Colonel jumped on the radio screaming at us for ten minutes about radio listening silence and proper radio procedures. He was hopping mad. Probably because the radio disturbed his sleep.
After he got off the radio, it was dead silent everywhere.
Then the radio keyed up, "You are not a friendly bear."
You could hear the entire battalion howling with laughter all through the forest.
The next morning, before breakfast, all tank commanders were instructed to report to the Colonel's command vehicle. He ripped on us big time and swore that he would find out who was on the radio last night.
He never did. And we continued to chuckle over it.