This addition from the London Gazette includes WW2 personnel lists for various military units, reports of people leaving the service due to illness, and notices of commendations and promotions in rank. The collection includes images of the original documents.
These and a whole lot more are free to search at https://www.thegazette.co.uk/
Two of my cousins twice removed are mentioned so many times in the Gazette I’m overwhelmed at the thought of recording them all! Definitely a case of “be careful what you wish for!”