Since I'm not well - versed in J J Fletcher's specific war novels, but in general, war novels might have detailed descriptions of military strategies. Maybe J J Fletcher's works also include such aspects.
I don't know exactly who J Andrews is in this story without reading it. But it's likely the protagonist or someone central to the events of the daydream - filled day.
I don't have enough details to know exactly who he is. He could be a writer, an artist, or just an ordinary person with an interesting story to tell in The New Yorker.
The J1 origin story could refer to many things. If J1 is a product, it might start with the idea of a designer or a company aiming to meet a certain market need. For example, if it's a new type of gadget, perhaps it was born out of the inventor's passion for simplifying daily tasks. They might have noticed a gap in the market for a more user - friendly device and thus began the journey of creating J1.
It's hard to say for sure. There could be elements of truth in it, or it could be completely made up. We'd need more details to determine its authenticity.
I'm not specifically familiar with J J Fletcher's war novels. However, generally, in war novels, you can expect themes like heroism, the impact of war on individuals and society. You might want to check local libraries or online bookstores and look for reviews of J J Fletcher's works to see if they match your interests.