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It encompasses two world wars and a “police action” in Korea that quickly turned into something much bigger.

During both world wars, many services were largely run by women, as a large number of men fought with the armed forces.

The subsequent referral form said this started off as an interest in world wars, but then turned towards a "fixation on Hitler" and admiration for him.

"Canada is the United States' closest neighbour, greatest ally and best friend," he said, noting that Canada fought alongside the US in two world wars, as well as in Korea and Afghanistan.

One minister told me: "It's a huge moment of history – American pledging a different way of doing business to what's essentially been in place since the second world war."