Question: What year did the country where the employer of Ben Rich MQM-105 Aquila finally adopt Daylight Saving Time?

full_context: Document 1: Lockheed MQM-105 Aquila: The Lockheed MQM-105 Aquila (Eagle) was the first small battlefield drone developed in the United States during the 1970s to act as a target designator for the US Army.
Document 2: IAI Scout: The IAI Scout (known in Israel under its Hebrew name זהבן - "Oriole") is a reconnaissance unmanned air vehicle developed in Israel in the 1970s by Israel Aircraft Industries as a competitor to the Tadiran Mastiff. During the 1970s, the Israeli military was becoming increasingly interested in battlefield UAVs, and in response IAI management finally decided that they were interested in the concept as well. The Scout had a similar configuration as the Mastiff, with a pusher propeller and a twin-boom tail.
Document 3: Robert Hails: Robert E. Hails (January 20, 1923 – March 16, 2012) was an American military officer who served as the vice commander of Tactical Air Command, Air Force deputy chief of staff for systems and logistics at the Pentagon, and commander of the Warner Robins Air Logistics Center. He flew a B-24 during the Pacific Theater of World War II and later was one of the few to fly the SR-71 Blackbird. As the Director of Maintenance Engineering, Air Force Logistics Command, he was responsible for engineering and developing pilotless reconnaissance aircraft used during the Vietnam War.
Document 4: Daylight saving time: Starting on April 30, 1916, the German Empire and its World War I ally Austria - Hungary were the first to use DST (German: Sommerzeit) as a way to conserve coal during wartime. Britain, most of its allies, and many European neutrals soon followed suit. Russia and a few other countries waited until the next year, and the United States adopted it in 1918.
Document 5: Daylight saving time: George Hudson proposed the idea of daylight saving in 1895. The German Empire and Austria - Hungary organized the first nationwide implementation, starting on April 30, 1916. Many countries have used it at various times since then, particularly since the energy crisis of the 1970s.
Document 6: Ben Rich: Benjamin Robert Rich (June 18, 1925 – January 5, 1995) was an American engineer and the second Director of Lockheed's Skunk Works from 1975 to 1991, succeeding its founder, Kelly Johnson. Regarded as the "father of stealth", Rich was responsible for leading the development of the F-117, the first production stealth aircraft. He also worked on the F-104, U-2, A-12, SR-71, and F-22, among others.
Document 7: History of unmanned aerial vehicles: Later, in November 1917, the Automatic Airplane was flown for representatives of the US Army. This led the army to commission a project to build an ``aerial torpedo '', resulting in the Kettering Bug which first flew in 1918. While the Bug's revolutionary technology was successful, it was not in time to fight in the war, which ended before it could be fully developed and deployed.
Document 8: Daylight saving time: Starting on 30 April 1916, Germany and its World War I ally Austria-Hungary were the first to use DST (German: Sommerzeit) as a way to conserve coal during wartime. Britain, most of its allies, and many European neutrals soon followed suit. Russia and a few other countries waited until the next year and the United States adopted it in 1918.
Document 9: Northrop Grumman B-2 Spirit: B - 2 Spirit A U.S. Air Force B - 2 Spirit flying over the Pacific Ocean in May 2006 Role Strategic stealth bomber National origin United States Manufacturer Northrop Corporation Northrop Grumman First flight 17 July 1989 Introduction April 1997 Status In service Primary user United States Air Force Produced 1987 -- 2000 Number built 21 Program cost US $44.75 billion (through 2004) Unit cost $737 million (1997 approx. flyaway cost)
Document 10: Daylight saving time: After Germany led the way with starting DST (German: Sommerzeit) during World War I on 30 April 1916 together with its allies to alleviate hardships from wartime coal shortages and air raid blackouts, the political equation changed in other countries; the United Kingdom used DST first on 21 May 1916. US retailing and manufacturing interests led by Pittsburgh industrialist Robert Garland soon began lobbying for DST, but were opposed by railroads. The US's 1917 entry to the war overcame objections, and DST was established in 1918.
Document 11: Kevin P. Chilton: Kevin Patrick "Chilli" Chilton (born November 3, 1954) is an American mechanical engineer, and former United States Air Force four-star General and test pilot. His last assignment was as Commander, U.S. Strategic Command from October 3, 2007 to January 28, 2011. Prior to his appointment to general officer ranks, Chilton spent 11 years of his military career as a NASA astronaut. He retired from the Air Force on February 1, 2011, after having achieved the highest rank of any military astronaut. On January 30, 2012, General Chilton was named to the board of directors of Orbital Sciences Corporation.
Document 12: Daylight saving time: New Zealander George Hudson proposed the modern idea of daylight saving in 1895. Germany and Austria-Hungary organized the first nationwide implementation, starting on 30 April 1916. Many countries have used it at various times since then, particularly since the energy crisis of the 1970s.
Document 13: United States Air Force: The fighter aircraft of the USAF are small, fast, and maneuverable military aircraft primarily used for air-to-air combat. Many of these fighters have secondary ground-attack capabilities, and some are dual-roled as fighter-bombers (e.g., the F-16 Fighting Falcon); the term "fighter" is also sometimes used colloquially for dedicated ground-attack aircraft. Other missions include interception of bombers and other fighters, reconnaissance, and patrol. The F-16 is currently used by the USAF Air Demonstration squadron, the Thunderbirds, while a small number of both man-rated and non-man-rated F-4 Phantom II are retained as QF-4 aircraft for use as Full Scale Aerial Targets (FSAT) or as part of the USAF Heritage Flight program. These extant QF-4 aircraft are being replaced in the FSAT role by early model F-16 aircraft converted to QF-16 configuration. The USAF has 2,025 fighters in service as of September 2012.
Document 14: David P. Cooley: David Paul Cooley (February 15, 1960 – March 25, 2009) was a Lockheed test pilot and retired United States Air Force (USAF) officer, responsible for developmental flight testing of the F-117 Nighthawk. He was killed while flying a test mission in an F-22 Raptor jet fighter over the high desert of Southern California.
Document 15: AAI RQ-2 Pioneer: The AAI RQ-2 Pioneer is an unmanned aerial vehicle (UAV) that had been utilized by the United States Navy, Marine Corps, and Army, and deployed at sea and on land from 1986 until 2007. Initially tested aboard USS "Iowa", the RQ-2 Pioneer was placed aboard s to provide gunnery spotting, its mission evolving into reconnaissance and surveillance, primarily for amphibious forces.
ground_truth: 1918
sub_queries: Ben Rich >> employer Answer: Lockheed
Lockheed MQM-105 Aquila >> country Answer: the United States
What year did the United States finally adopt Daylight Saving Time? Answer: 1918