Bosai kunren

On my way in this morning, I saw a group of schoolkids out wearing their Bosai Zukin, which are designed to protect their heads from sparks, ashes and fire, in the event of an emergency like an earthquake or housefire.
The last time I saw one was at the Chiyoda Library Museum, where they had a display of wartime relics. Hirata-san from my office said that they are modelled on a samurai’s headgear.
Not sure why the kids were doing it today, if it is some kind of national safety day or something.