paragraph_text: Many soldiers of color served their country with distinction during World War II. There were 125,000 African Americans who were overseas in World War II. Famous segregated units, such as the Tuskegee Airmen and 761st Tank Battalion and the lesser - known but equally distinguished 452nd Anti-Aircraft Artillery Battalion, proved their value in combat, leading to desegregation of all U.S. armed forces by order of President Harry S. Truman in July 1948 via Executive Order 9981.

paragraph_text: The 2nd Chemical Battalion is a United States Army chemical unit stationed at Fort Hood, Texas, United States, and is part of the 48th Chemical Brigade. The battalion can trace its lineage from the 30th Engineer Regiment (Gas and Flame) and has served in World War I, World War II, Korean War, Operation Desert Storm, and Operation Iraqi Freedom.

paragraph_text: London's first and only cable car, known as the Emirates Air Line, opened in June 2012. Crossing the River Thames, linking Greenwich Peninsula and the Royal Docks in the east of the city, the cable car is integrated with London's Oyster Card ticketing system, although special fares are charged. Costing £60 million to build, it carries over 3,500 passengers every day, although this is very much lower than its capacity. Similar to the Santander Cycles bike hire scheme, the cable car is sponsored in a 10-year deal by the airline Emirates.

paragraph_text: The slightly larger Thai Army was a relatively well-equipped force. Consisting of 60,000 men, it was made up of four armies. The largest were the Burapha Army with five divisions and the Isan Army with three divisions. Independent formations under direct control of the army high command included two motorised cavalry battalions, one artillery battalion, one signals battalion, one engineer battalion, and one armoured regiment. The artillery was a mixture of Krupp guns and modern Bofors guns and Howitzers, while 60 Carden Loyd tankettes and 30 Vickers 6-ton tanks made up the bulk of the army's tank force.

paragraph_text: The Santorini cable car connects the port with the town of Thera in Santorini island in Greece. It was constructed as a donation of the “Loula & Evangelos Nomikos Foundation”. The cable car was built by Doppelmayr, has a capacity of 1,200 people per hour (600 per hour in each direction). The journey takes 3 minutes.

paragraph_text: The Battle of Lang Vei (Vietnamese: "Trận Làng Vây") began on the evening of 6 February and concluded during the early hours of 7 February 1968, in Quảng Trị Province, South Vietnam. Towards the end of 1967 the 198th Tank Battalion, People's Army of Vietnam (PAVN) 203rd Armored Regiment, received instructions from the North Vietnamese Ministry of Defense to reinforce the 304th Division as part of the "Route 9-Khe Sanh Campaign". After an arduous journey down the Ho Chi Minh trail in January 1968, the 198th Tank Battalion linked up with the 304th Division for a major offensive along Highway 9, which stretched from the Laotian border through to Quảng Trị Province. On 23 January, the 24th Regiment attacked the small Laotian outpost at Bane Houei Sane, under the control of the Royal Laos Army BV-33 'Elephant' Battalion.

paragraph_text: In November 1936, the US Army's cavalry branch decided to modernize and needed a fully armored vehicle, capable of keeping up with the cavalry and of fulfilling regular combat duties. Prohibited from developing tanks by the National Defense Act of 1920 which defined "tanks" as the responsibility of the infantry, the phrase "combat car" was used as a legal formality. The T5 Combat Car had been built on similar lines to the infantry's T2 Light Tank, leading to the M1 Combat Car. After the T4 Combat Car had been tested, the Ordnance Committee recommended working on a road-track convertible tank design. The T6 Combat Car design was cancelled but in November 1936 the Chief of Cavalry ordered that work continue on designing a convertible tank. Designed and built at the Rock Island Arsenal between 1937 and 1938, the T7 Combat Car was based on the M1 Combat Car but with an extended chassis and a convertible suspension – the ability to travel using wheels or tracks. Theoretically, it was more versatile than a conventional tank, having the ability to move with and without tracks on roads, much like the Christie designed tanks. The main gun of the project was traditional – one .50 cal (12.7 mm) M2 Browning heavy machine gun and three .30 caliber (7.62 mm) M1919 machine guns. However, this armament was useful only against infantry, and was inadequate for use against other tanks of the period.

paragraph_text: Early attempts to land tanks for close support and to get past the sea wall failed when the LCM landing craft carrying them hung up behind the reef. Some of these craft were hit out in the lagoon while they waited to move in to the beach and either sank outright or had to withdraw while taking on water. Two Stuart tanks were landed on the east end of the beach but were knocked out of action fairly quickly. The battalion commander of 3rd Battalion, 2nd Regiment found several LCMs near the reef and ordered them to land their Sherman tanks and head to Red Beach 2. The LCMs dropped ramps and the six tanks came down, climbed over the reef and dropped into the surf beyond. They were guided in to shore by Marines on foot, but several of these tanks fell into holes caused by the naval gunfire bombardment and sank. The surviving Shermans on the western end of the island proved considerably more effective than the lighter Stuarts. They helped push the line in to about 300 yards (270 m) from shore. One became stuck in a tank trap and another was knocked out by a magnetic mine. The remaining tank took a shell hit to its barrel and had its 75 mm gun disabled. It was used as a portable machine gun pillbox for the rest of the day. A third platoon was able to land all four of its tanks on Red 3 around noon and operated them successfully for much of the day, but by day's end only one tank was still in action.

paragraph_text: The 5th Battalion, 52nd Air Defense Artillery Regiment (United States) is an air defense artillery battalion in the United States Army based at Fort Bliss, Texas. Known as "five-five-deuce," the battalion motto is "Always Prepared" The former motto was "We Build Warriors". The battalion is part of 11th Air Defense Artillery Brigade and the 32nd Army Air & Missile Defense Command (32nd AAMDC).

paragraph_text: San Francisco cable car system Cable car on Powell Street Overview Owner San Francisco Municipal Transportation Agency Area served Chinatown, Financial District, Fisherman's Wharf, Nob Hill, Russian Hill, Union Square Locale San Francisco Transit type Cable car Number of lines Line number 59 Powell - Mason 60 Powell - Hyde 61 California St. Number of stations 62 Daily ridership 20,100 (2014) Annual ridership 7,409,400 (2014) Headquarters San Francisco Cable Car Museum Website sfmta.com Operation Began operation California St. line: 1878 Powell - Mason line: 1888 Powell - Hyde line: 1957 Operator (s) San Francisco Municipal Railway Reporting marks MUNI Character Street running with some reserved right - of - ways Number of vehicles California St. line: 12 double - ended cars Powell - Mason / Hyde lines: 28 single - ended cars Train length 1 grip car Technical System length California St. line: 1.4 mi (2.3 km) Powell - Mason line: 1.6 mi (2.6 km) Powell - Hyde line: 2.1 mi (3.4 km) No. of tracks Track gauge 3 ft 6 in (1,067 mm) Top speed 9.5 mph (15.3 km / h) hide System map

paragraph_text: Some high mountain villages, such as Avoriaz (in France), Wengen, and Zermatt (in Switzerland) are accessible only by cable car or cog-rail trains, and are car free. Other villages in the Alps are considering becoming car free zones or limiting the number of cars for reasons of sustainability of the fragile Alpine terrain.

paragraph_text: Meanwhile, U.S. garrisons in Japan continually dispatched soldiers and matériel to reinforce defenders in the Pusan Perimeter. Tank battalions deployed to Korea directly from the U.S. mainland from the port of San Francisco to the port of Pusan, the largest Korean port. By late August, the Pusan Perimeter had some 500 medium tanks battle-ready. In early September 1950, ROK Army and UN Command forces outnumbered the KPA 180,000 to 100,000 soldiers. The UN forces, once prepared, counterattacked and broke out of the Pusan Perimeter.

paragraph_text: Knoxville Raceway is a semi-banked 1/2 mile dirt oval raceway (zook clay) located at the Marion County Fairgrounds in Knoxville, Iowa, United States. Races at the "Sprint Car Capital of the World" are held on Saturday nights from April through September each year. Some special events may start as early as Wednesday and build up to Saturday. Regular events include 305 cubic inch, 360 cubic inch and 410 cubic inch sprint car racing. Each August, the Raceway holds the paramount sprint car event in the United States, the Knoxville Nationals. The track is governed by the 24-member fair board elected by Marion County residents.

paragraph_text: The 1st Battalion, 107th Cavalry Regiment was a unit of the Ohio Army National Guard, with troops in multiple locations throughout northeastern Ohio and has served in the United States of America's major wars and conflicts since 1898 until its inactivation on 31 August 2007.

paragraph_text: 1st Battalion, 3rd Marines (1/3) is an infantry battalion in the United States Marine Corps based out of Marine Corps Base Hawaii. Nicknamed the "Lava Dogs", the battalion consists of approximately 800 Marines and sailors and falls under the command of the 3rd Marine Regiment of the 3rd Marine Division.

paragraph_text: He assumed duties again at Camp Meade, Maryland, commanding a battalion of tanks, where he remained until 1922. His schooling continued, focused on the nature of the next war and the role of the tank in it. His new expertise in tank warfare was strengthened by a close collaboration with George S. Patton, Sereno E. Brett, and other senior tank leaders. Their leading-edge ideas of speed-oriented offensive tank warfare were strongly discouraged by superiors, who considered the new approach too radical and preferred to continue using tanks in a strictly supportive role for the infantry. Eisenhower was even threatened with court martial for continued publication of these proposed methods of tank deployment, and he relented.

paragraph_text: After the Incheon landing, the 1st Cavalry Division began its northward advance from the Pusan Perimeter. "Task Force Lynch" (after Lieutenant Colonel James H. Lynch), 3rd Battalion, 7th Cavalry Regiment, and two 70th Tank Battalion units (Charlie Company and the Intelligence–Reconnaissance Platoon) effected the "Pusan Perimeter Breakout" through 106.4 miles (171.2 km) of enemy territory to join the 7th Infantry Division at Osan. The X Corps rapidly defeated the KPA defenders around Seoul, thus threatening to trap the main KPA force in Southern Korea.

paragraph_text: The Tiger II was issued to heavy tank battalions of the Army and the Waffen-SS. It was first used in combat by 503rd Heavy Panzer Battalion during the Allied invasion of Normandy on 11 July 1944; on the Eastern Front, the first unit to be outfitted with the Tiger II was the 501st Heavy Panzer Battalion, which by 1 September 1944 listed 25 Tiger IIs operational.

paragraph_text: 141st Signal Battalion ("The Communicators") was a United States battalion which deployed to install, operate and maintain C4I systems in support of 1st Armored Division operations, major subordinate commands and attached units as required.

paragraph_text: The Stein (2,172 m) is a mountain of the Swiss Lepontine Alps, overlooking Obersaxen in the canton of Graubünden. It lies between the main Rhine valley, the Surselva, and the Lumnezia. A cable car station (2,144 m) is located near the summit.

Question: When were cable cars introduced to the U.S. city where tank battalions were located prior to the Korean War?
Answer: 1878