[Espy]

Originally Posted by Lee

No, but they were allied to the country in question.

Hrm...

There are a lot of teams, squadrons, and whatever known as the Red Devils, but "allied to [Japan]" makes me think... military group (?) of the Axis powers.

So that rules out the UK and the US, as well as France. The three main Axis powers were Germany, Japan, and Italy. But "responsible for the creation of" makes it sound less like a military group and more like... an invention? So, either a military group, or a military-grade invention, of either Germany or Italy.