was bought by a U.S. defense contractor, from whom the CIA secretly bought five drones (now called the "Gnat"). Karem agreed to produce a quiet engine for the vehicle, which had until then sounded like "a lawnmower in the sky". The new development became known as the "Predator". General Atomics Aeronautical Systems (GA) was awarded a contract to develop the Predator in January 1994, and the initial Advanced Concept Technology Demonstration (ACTD) phase lasted from January 1994 to June 1996. First flight took place on 3 July 1994 at the El Mirage airfield in the Mojave Desert. The aircraft itself was a derivative of the GA Gnat 750. During the ACTD phase, three systems were purchased from GA, comprising twelve aircraft and three ground control stations. From April through May 1995, the Predator ACTD aircraft were flown as a part of the Roving Sands 1995 exercises in the U.S. The exercise operations were successful which led to the decision to deploy the system to the Balkans later in the summer of 1995. During the ACTD, Predators were operated by a combined Army/Navy/Air Force/Marine team managed by the Navy's Joint Program Office for Unmanned Aerial Vehicles (JPO-UAV) and first deployed to Gjader, Albania, for operations in the former Yugoslavia in spring 1995. By the start of the United States Afghan campaign in 2001, the USAF had acquired 60 Predators, but lost 20 of them in action. Few if any of the losses were from enemy action, the worst problem apparently being foul weather, particularly icy conditions. Some critics within the Pentagon saw the high loss rate as a sign of poor operational procedures. In response to the losses caused by cold weather conditions, a few of the later USAF Predators were fitted with de-icing systems, along with an uprated turbocharged engine and improved avionics. This improved "Block 1" version was referred to as the "RQ-1B", or the "MQ-1B" if it carried munitions; the corresponding air vehicle designation was "RQ-1L" or "MQ-1L". The Predator system was initially designated the RQ-1 Predator. The "R" is the United States Department of Defense designation for reconnaissance and the "Q" refers to an unmanned aircraft system. The "1" describes it as being the first of a series of aircraft systems built for unmanned reconnaissance. Pre-production systems were designated as RQ-1A, while the RQ-1B (not to be confused with the Predator B, which became the MQ-9 Reaper)