The CH-47 Chinook that crashed Saturday in Afghanistan is the workhorse helicopter of the military, used for decades to haul large numbers of troops and quantities of equipment.
Depending on the configuration, the tandem-rotor Chinook can carry 33 to 55 troops, plus two pilots on the flight deck, according to Jane's Defence Equipment and Technology.
The Boeing-built copter runs on two Honeywell engines providing 3,000 to 4,000 horsepower each. It is capable of speeds up to 159 mph. The front rotor turns counter-clockwise while the rear rotor turns clockwise. The Chinook's three cargo hooks can lift up to 60,000 pounds of equipment.
The military fleet of nearly 1,000 Chinooks comprises multiple configurations with different types of mission-specific avionics, armor and equipment, including night vision, weather radar, infrared engine noise suppression and infrared countermeasures to ward off heat-seeking missiles.
About 450 Chinooks have been sold to other countries' militaries, according to Jane's All the World's Aircraft.