This is what the U.S. Army prefers to use these days for heavy-lifting aerial duties: the CH-47 Chinook . The newest version of the tandem-rotor craft, the CH-47F, debuted in mid-August. Among the notable features of the upgrade is that the older analog gauges have been replaced with digital screens . The CH-47F has two 4,800-horsepower engines that can push it to a speed of 175 miles per hour and can hoist more than 21,000 pounds.
In this photo from December 2006, soldiers parachute out of an earlier model over Fort Lee, Va. The first Chinooks flew almost 50 years ago.
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