America's military top brass have left their posts to attend a meeting with the US president and defence secretary about the "warrior ethos".

Hundreds of officers travelled from around the world to attend the occasion at a marine corps base in Quantico, Virginia. It is a rare gathering of the US military's top tier, all in the one place.

There has been much speculation about the substance of Tuesday's meeting, given its scale and short notice with minimal explanation.

Donald Trump told NBC News, Sky's US partner network , it is "really just a very nice meeting talking about how well we're doing militarily, talking about being in great shape, talking about a lot of good, positive things".

"We have some great people coming in, and it's just an esprit de corps ," he said.

"You kn

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