The Kaman K-MAX (company designation K-1200) is an American helicopter with intermeshing rotors (synchropter) by Kaman Aircraft. It is optimized for external cargo load operations, and is able to lift a payload of over 6,000 pounds (2,722 kg), which is more than the helicopter’s empty weight. An unmanned aerial vehicle version with optional remote control has been developed and evaluated in extended practical service in the war in Afghanistan.
In December 2011, an unmanned K-MAX was reported to be at work in Afghanistan. On 17 December 2011, the U. S. Marine Corps conducted the first unmanned aerial system cargo delivery in a combat zone using the unmanned K-MAX, moving about 3,500 pounds of food and supplies to troops at Combat Outpost Payne. A third unmanned K-MAX in the U.S. was tested in 2012 to deliver cargo to a small homing beacon with three-meter precision. As of February 2013, the K-MAX had delivered two million pounds of cargo in 600 unmanned missions over more than 700 flight hours.
An air force, also known in some countries as an aerospace force or air army, is in the broadest sense, the national military branch that primarily conducts aerial warfare.