I have a lot of Propaganda posters on this site, most of them from WW1 and WW2 but today was the first time I have ever seen this one (mild excitement)! It makes sense really, if players from great sporting teams can enlist then the government were keen to tell you about it.
I have read about whole football teams from the early 1900's just vanishing when all of the brave men enlisted for WW1. No wonder it was around this time that to keep sport going in the country they created lots of women's football teams that sadly disappeared when the War finished.