Britain first is the British nationalist party that wants to leave EU “superstate” as they call it. In their fight against EU birocrats they started a trend of creating meme and fact pictures to spread their message however one little mistake was made. In an effort to tell a story how British pilots fought for Britan and not for EU, they accidentally posted a No.301 RAF Squadron that was formed by officers from Czechoslovakia. So it kind of started a viral effect where people joked about the irony of that post.
But they’re probably not the best example to use if you want to leave EU
Fact: sergeant in the No. 310 Squadron was one Bohumir Furst, or Sgt. B Furst.