The Pentagon's Mobility Capabilities and Requirements Study shows that the US military requires about 32.7 million ton miles of strategic airlift capacity per day, a figure already exceeded by the Air Force's existing fleet of C-5 and C-17 transports, Air Force Secretary Michael Donley told House defense overseers, March 10, 2010. The airlift-capacity requirement equates "to the low 300s" of strategic airlifters, a figure already surpassed by the inventory of 111 C-5s and 223 planned C-17s. Here, several C-17s sit on the ramp at Elmendorf AFB, Alaska, waiting to take off during a large-formation exercise, Feb. 10, 2010.
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