US President Obama has nominated Senator Chuck Hagel as his new defence secretary.
The former Republican senator for Nebraska will take over the top Pentagon job from Leon Panetta if his appointment is confirmed by the Senate.
President Obama said that US troops would see in Senator Hagel a "decorated combat veteran of character and strength".
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"My sincerest apologies to everyone who purchased tickets and were planning to come to the upcoming shows."
His comments at the Defence and Security Forum on Monday came after a £20 billion black hole in the budget for the next decade emerged.