The Uninhabited Combat Armed Rotorcraft or UCAR was a program carried out by DARPA and the United States Army in 2003-2004 to develop an unmanned combat helicopter. Originally named the "Robotic Rotary Wingman", a requirement was issued in the spring of 2002, specifying a robot rotorcraft to be armed with missiles, unguided rockets, guns, and nonlethal directed energy weapons, and with the capability of attacking masked targets. The UCAR was to cost $4 million to $8 million USD, and have operating costs 10% to 40% of those of an AH-64 Apache. Operational cost reductions were expected to be achieved at least in part by reducing the number of personnel required to maintain and operate the machine.