Obama’s perceived lack of a clear strategic approach to the problems in the Middle East and Ukraine played a part.
![Hagel was an obvious choice to take the fall, writes Korb [AP]](https://www.aljazeera.com/wp-content/uploads/2014/11/2014112961032575734_20.jpeg?resize=270%2C180&quality=80)
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How American security goals can be advanced after US troops withdraw from Afghanistan at the end of the year.
![Currently, the US and NATO have about 50,000 troops in Afghanistan [Reuters]](https://www.aljazeera.com/wp-content/uploads/2014/03/20143284736982734_20.jpeg?resize=270%2C180&quality=80)
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