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FBI has been investigating whether retired general secretly lobbied for Gulf country
Retired four-star general is being probed over whether he failed to register as a lobbyist for Qatar
Departure comes as strategy for tackling insurgents is criticised
International coalition chief Allen says militants advancing in Iraq and Syria
Scandal that brought down Petraeus has created a security crisis for Obama
I wonder whether the turmoil in the US national security elite reflects some sort of aimlessness
Afghan authorities to get greater oversight on operations
Western advisers confined to base as riots enter a fifth day
International Edition