By Anna Coren, reporting from Delaram, Afghanistan
U.S. Marines stand under the blazing sun at Camp Bastion airfield waiting for their ride to take them far beyond the perimeter fence.
Wearing body armor and weapons, they dump their helmets and bags in the dirt and look out onto one of Afghanistan's busiest runways.
A $25 million Harrier jet flies past, leaving the roar of its engine in its wake, while a monstrous C-130 Hercules touches down to pick up troops and cargo. An Osprey helicopter - half helicopter, half plane - hovers in the distance before landing to join the dozen other Ospreys sitting on the tarmac.
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