Another of Robert's pub tales.
When he was still an Army helicopter pilot, Robert was sent on a prestigious, multinational mountain flying course in the Pyrenees. He said it was an exhilarating experience, but even while they were on the course some of the lads started getting bored and having ideas for some unofficial fun. Eventually, a few of them requisitioned a number of large insulated containers from stores, and took a surprising amount of fresh snow from a glacier - similar to the one illustrated, perhaps.
This was smartly transported to one of the naturist beaches next to Cap d'Agde and there - in the height of the season - the pilots had a monster snowball fight, in full flying kit. Naturally there was some collateral damage to the unfortunate naturists, and there were a number of formal complaints, which were dismissed out of hand as ridiculous. How could such a thing have happened? - snow? - on a Mediterranean beach in August?
Case dismissed. Another example of something that never happened. Maybe there is a recurrent theme developing here.