In case you have not noticed, this Armistice-100 weekend has brought free military record offers from Ancestry/Fold3, FindMyPast and MyHeritage.
https://www.ancestry.co.uk
https://www.findmypast.co.uk
https://www.myheritage.com/research/category-3000/military
If you think it all finished at 11am on 11-11-1918, have a read of this blog post:
The war that did not end at 11am on 11 November