Dec 1944, Belgium Jack Damn is a radioman crawling around in snow

[Irish_Dem]

2. Cold haunted Battle of the Bulge vets for the rest of their lives.

Many US soldiers froze to death, and there were thousands of frostbite and trench foot injuries.

Deadly cold weather, freezing rain and snow with frigid temperatures made for misery.

On top of that the Americans were outnumbered, and surrounded by a German surprise attack.
It looked dire for the Yanks.

The German general asked the Americans to surrender and the famous "NUTS" was the American general's
reply. (Meaning the Germans could go to hell.)

The Americans held on despite the desperate conditions. And won the battle

They paid a huge price with 75,000 casualties. It was one of the largest and bloodiest battles of WWII.

It was the last major German battle, a desperate attempt by Hitler to stop the Allies.
It didn't work, the catastrophic German losses in the battle prevented Germany from resisting
Allied forces and four months later Germany surrendered.

So your father in law was part of stopping Hitler.