Warning
At the other extreme, I had the unfortunate experience recently to read a book - thankfully picked up secondhand - by an author one would have thought knew better, or at least has contacts who should have coughed politely; ( NB, not Tom Clancy who knows his stuff, but a pale imitator ).
The premise is the Falklands war set in the near future.
The only comment this chap gets right is that without Sea Harrier we're screwed.
Otherwise, he makes much of the fact that " The GR9 can't fly at night " which will come as a bit of a surprise to some !
Ark Royal is sunk quickly by a Kilo sub, and the U.S. step in with clandestine op's to avenge her & keep the status quo.
I wouldn't even have this book in the smallest room for emergencies !