5
4 Bradleys & 1 Leo2 destroyed in one picture
(lemmygrad.ml)
About $30mio just for those 5, not counting the mine-clearing tank in the top right
The brits sent them, but I remember them saying they'll never actually fight in the frontlines. Something about being 'too complicated' or 'too expensive'. Basically the challengers are purely for flex, they'll be decimated in the frontlines, and the Brits know it.