Back in the 50s I worked with a vet who served as an Armed Guard (manned the deck guns on these merchants) on the runs to Russia.
He said that right in the middle of attacks by U-boats and Condors (bombers), the shop steward would be running about, counting how many bombs were dropped near the ship: "A near miss, that's another $50, there's a wake (torpedo), that's $100" and so on. Apparently their contract included bonuses for being shot at.
When the crew got paid, they'd pass the hat and give the AGs a share of the bonuses. He said that most guys were pretty generous but some "had fish hooks in their pockets and wouldn't contribute a dime."
I had never heard of either practice, so this might be an Urban Legend, but the vet had no reason to lie.