Question: What is an infantry that was featured in Black Hawk Down?

Context paragraphs:
Battle of Apple River Fort: The Battle of Apple River Fort, occurred on the late afternoon of June 24, 1832 at the Apple River Fort, near present-day Elizabeth, Illinois, when Black Hawk and 200 of his "British Band" of Sauk and Fox were surprised by a group of four messengers en route from Galena, Illinois.  One of the couriers was wounded in the thigh as the riders quickly made for the protection of the nearby stockade.  Courier Fred Dixon rode ahead to warn some 70 settlers of the approaching Sauk and Fox, thus saving their lives.The small company of militia at the fort, about 28-30 men and boys led by Captain Clack Stone, fought off Black Hawk's 150-man war party in an action that lasted about an hour.  The withering pace of the gunfire eventually convinced Black Hawk that the fort was too heavily defended to lead a direct attack.  He considered burning the fort, then switched to raiding cabins of foodstuffs, clothing and cooking utensils.  In the gathering darkness, Black Hawk and his war party retreated.

Blackhawk, South Dakota: Black Hawk (sometimes Black hawk) is an unincorporated census-designated place (CDP) in Meade County, South Dakota, United States.  The population was 2,892 at the 2010 census.  Black Hawk has been assigned the ZIP code of 57718.  Located along Interstate 90, Black Hawk is part of the Rapid City metropolitan area.

British Band: The British Band was a mixed-nation group of Native Americans commanded by the Sauk leader Black Hawk, which fought against Illinois and Michigan Territory militias during the 1832 Black Hawk War.  The band was composed of about 1,500 men, women, and children from the Sauk, Meskwaki, Fox, Kickapoo, Potawatomi, Ho-Chunk, and Ottawa nations; about 500 of that number were warriors.  Black Hawk had an alliance with the British that dated from the War of 1812, giving them their colloquial name.  The band crossed the Mississippi River from Iowa into Illinois in an attempt to reclaim their homeland and in violation of several treaties.  Subsequently, both the Illinois and Michigan Territory militia were called up and the Black Hawk War ensued.

Harbin Z-20: The Harbin Z-20 or Zhi-20 is a medium lift helicopter produced in the Northeast of China.  Its first flight was on 23 December 2013.  The helicopter has a maximum takeoff weight in the range of 10 tons, can drop troops at locations of up to 3,000 ft altitude, and could operate from the Chinese aircraft carrier Liaoning.  It is thought to be comparable to the US made Sikorsky UH-60 Black Hawk helicopter, the civilian Sikorsky S-70C-2 variant of which has been used by the People's Liberation Army since 1984.  Some sources suggest that the Z-20 is a copy of the Black Hawk and link the design to the Black Hawk that was abandoned by US special forces in Pakistan during the operation to kill Osama bin Laden on 1 May 2011.  The sources say that Pakistan allowed Chinese officials to examine the Black Hawk wreckage.  However, Aviation Week also points out that although some aspects of the design do appear similar, such as the tail wheel arrangement, there are also marked differences.  For example, the Chinese Z-20 has a five blade rotor compared with the Black Hawks' four blades.

Black Hawk Tree: The Black Hawk Tree, or Black Hawk's Tree, was a cottonwood tree located in Prairie du Chien, Wisconsin, United States.  Local legend held that Sauk leader Black Hawk used it to elude his pursuers, though there are differing details and versions of the story.  One version puts Black Hawk's presence in the tree during the 1790s, while another states it was after the conclusion of the 1832 Black Hawk War and involved a young Lieutenant Jefferson Davis.  In reality, it is unlikely that Black Hawk ever used the tree to hide, though he was probably in Prairie du Chien once after his surrender at the end of the 1832 Black Hawk War.  The tree was felled by a windstorm during the 1920s.

Black Hawk War: The Black Hawk War was a brief conflict between the United States and Native Americans led by Black Hawk, a Sauk leader.  The war erupted soon after Black Hawk and a group of Sauks, Meskwakis, and Kickapoos, known as the "British Band", crossed the Mississippi River, into the U.S. state of Illinois, from Iowa Indian Territory in April 1832.  Black Hawk's motives were ambiguous, but he was apparently hoping to avoid bloodshed while resettling on tribal land that had been ceded to the United States in the disputed 1804 Treaty of St. Louis.

Black Hawk Purchase: The Black Hawk Purchase, which can sometimes be called the Forty-Mile Strip or Scott's Purchase, extended along the West side of the Mississippi River from the north boundary of Missouri North to the Upper Iowa River.  The Upper Iowa River is in the northeast corner of Iowa, from Missouri nearly to Minnesota.  It was fifty miles wide at the ends, and forty in the middle, and is sometimes called the "Forty-Mile Strip".  The land, originally owned by the Sauk, Meskwaki (Fox), and Ho-Chunk (Winnebago) Native American people, was acquired by treaty following their defeat by the United States in the Black Hawk War.  After being defeated the Sauk and Mesquakie were forced to relinquish another 2.5 million hectares or (6 million acres) and give up their rights to plant, hunt, or fish on the land.  The purchase was made for $640,000 on September 21, 1832 and was named for the chief Black Hawk, who was held prisoner at the time the purchase was completed.  The Black Hawk Purchase contained an area of 6 million acres (24,000 km²), and the price was equivalent to 11 cents/acre ($26 per km²).  The region is bounded on the East by the Mississippi River and includes Dubuque, Fort Madison, and present-day Davenport.

Black Hawk Down (book): Black Hawk Down: A Story of Modern War is a 1999 book by journalist Mark Bowden.  It documents efforts by the Unified Task Force to capture Somali faction leader Mohamed Farrah Aidid in 1993, and the resulting battle in Mogadishu between United States forces and Aidid's militia.  One of the key events is the downing of two United States UH-60 Black Hawk helicopters, from which the book derives its title, and the attempt to rescue their crews.  United States forces included Army Rangers, 160th Special Operations Aviation Regiment, 10th Mountain Division, Delta Force and Navy SEALs, with United Nations peacekeeping forces also involved.

Antonga Black Hawk: Antonga, or Black Hawk (born c. 1830; died September 26, 1870), was a nineteenth-century war chief of the Timpanogos Tribe in what is the present-day state of Utah.  He led the Timpanogos against Mormon settlers and gained alliances with Paiute and Navajo bands in the territory against them during what became known as the Black Hawk War in Utah (1865–1872).  Although Black Hawk made peace in 1867, other bands continued raiding until the US intervened with about 200 troops in 1872.  Black Hawk died from a gunshot wound he received while trying to rescue a fallen warrior, White Horse, in 1870, at Gravely Ford Richfield, Utah, June 10, 1866.  The wound never healed and complications set in.

10th Mountain Division: The 10th Mountain Division (Light Infantry) is a light infantry division in the United States Army based at Fort Drum, New York.  Originally constituted as a mountain warfare unit, the division was the only one of its size to receive intense specialized training for fighting in mountainous and arctic conditions.  Today, the 10th honors that legacy by retaining the "Mountain" tab on their shoulder sleeve insignia.

Supporting paragraphs: Black Hawk Down (book) 10th Mountain Division
Answer: 10th Mountain Division