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Packed and ready to leave? Perhaps not quite yet. Capt. Robyn Haake/US Army/AFP via Getty Images

The Iraq War has cost the US nearly $2 trillion

The Pentagon has spent more than $800 billion on military operations in Iraq. But that doesn't include money needed to care for veterans, rebuild the country or pay interest on war debt.
A new-generation weapon, in white, launches from an older one, the B-52 bomber. Mike Cassidy/U.S. Air Force

US, Russia, China race to develop hypersonic weapons

Missiles that fly 3,000 mph or faster – much faster than the speed of sound – are the next generation of high-technology weapons.