Question: The Pueblo Chemical Agent-Destruction Pilot Plant is what that contains the prototypical substance of the sulfur-based family of cytotoxic and vesicant chemical warfare agents known as the sulfur mustards which have the ability to form large blisters on exposed skin and in the lungs?

Context paragraphs:
Adamsite: Adamsite or DM is an organic compound; technically, an arsenical diphenylaminechlorarsine, that can be used as a riot control agent.  DM belongs to the group of chemical warfare agents known as vomiting agents or sneeze gases.  First synthesized in Germany by Heinrich Otto Wieland in 1915, it was independently developed by the US chemist Roger Adams (for whom it is named) at the University of Illinois in 1918.

Pueblo Chemical Agent-Destruction Pilot Plant: The Pueblo Chemical Agent-Destruction Pilot Plant (PCAPP) is a chemical weapons destruction facility that has been built to destroy the chemical weapons stockpile at the Pueblo Chemical Depot, in southeastern Colorado.  The depot contains munitions that are part of the U.S. national chemical weapons stockpile.  Before chemical weapons disposal began at PCAPP, these munitions contained 2,613 U.S. tons of mustard agent.  The weapons have been stored at the 23000 acre depot since the 1950s.

267th Chemical Company: The 267th Chemical Company was a military unit of the U.S. Army Chemical Corps responsible for the surety of chemical warfare agents dubbed "RED HAT" deployed to the Islands of Okinawa, Japan and subsequently Johnston Atoll in the Pacific Ocean.  A recently discovered Army document reveals that the true mission of the 267th Chemical Company was the operation of the Okinawa deployment site as part Project 112.  Project 112 was a 1960s biological warfare field test program that was conducted by the Deseret Test Center.  Okinawa is not listed as a test site under Project 112 by the U.S. Department of Defense.

Biological warfare: Biological warfare (BW)—also known as germ warfare—is the use of biological toxins or infectious agents such as bacteria, viruses, and fungi with the intent to kill or incapacitate humans, animals or plants as an act of war.  Biological weapons (often termed "bio-weapons", "biological threat agents", or "bio-agents") are living organisms or replicating entities (viruses, which are not universally considered "alive") that reproduce or replicate within their host victims.  Entomological (insect) warfare is also considered a type of biological weapon.  This type of warfare is distinct from nuclear warfare and chemical warfare, which together with biological warfare make up NBC, the military acronym for nuclear, biological, and chemical warfare using weapons of mass destruction (WMDs).  None of these are conventional weapons, which are deployed primarily for their explosive, kinetic, or incendiary potential.

Pueblo Chemical Depot: The Pueblo Chemical Depot is a chemical weapons storage site located in Pueblo County, Colorado, United States.  The Pueblo Chemical Depot is one of the last two sites in the United States with chemical munitions and chemical material.  The Pueblo Chemical Agent Destruction Pilot Plant (PCAPP) which is under the Assembled Chemical Weapons Alternatives (ACWA) program will destroy its stockpile of 155-mm and 105-mm artillery shells and 4.2-in.  mortars, all of which contain a form of the chemical agent mustard.

Sulfur mustard: Sulfur mustard, commonly known as mustard gas, is the prototypical substance of the sulfur-based family of cytotoxic and vesicant chemical warfare agents known as the sulfur mustards which have the ability to form large blisters on exposed skin and in the lungs.  They have a long history of use as a blister-agent in warfare and along with organoarsenic compounds are the most well-studied such agents.  Related chemical compounds with similar chemical structure and similar properties form a class of compounds known collectively as sulfur mustards or mustard agents.  Pure sulfur mustards are colorless, viscous liquids at room temperature.  When used in impure form, such as warfare agents, they are usually yellow-brown and have an odor resembling mustard plants, garlic, or horseradish, hence the name.  The common name of "mustard gas" is considered inaccurate because the sulfur mustard is not actually vaporized, but dispersed as a fine mist of liquid droplets.  Sulfur mustard was originally assigned the name LOST, after the scientists Wilhelm Lommel and Wilhelm Steinkopf, who developed a method of large-scale production for the Imperial German Army in 1916.

Nitrogen mustard: Nitrogen mustards are cytotoxic chemotherapy agents derived from mustard gas.  Although their common use is medicinal, in principle these compounds can also be deployed as chemical warfare agents.  Nitrogen mustards are nonspecific DNA alkylating agents.  Nitrogen mustard gas was stockpiled by several nations during the Second World War, but it was never used in combat.  As with all types of mustard gas, nitrogen mustards are powerful and persistent blister agents and the main examples (HN1, HN2, HN3, see below) are therefore classified as Schedule 1 substances within the Chemical Weapons Convention.  Production and use is therefore strongly restricted.

HN3 (nitrogen mustard): Tris(2-chloroethyl)amine is the organic compound with the formula N(CHCHCl).  Often abbreviated HN3, it is a powerful blister agent and a nitrogen mustard gas (although it is not a gas) used for chemical warfare.  HN3 was the last of the nitrogen mustard agents developed.  It was designed as a military agent and is the only one of the nitrogen mustards that is still used for military purposes.  It is the principal representative of the nitrogen mustards because its vesicant properties are almost equal to those of HD and thus the analogy between the two types of mustard is the strongest.  As a vesicant the use and production is strongly restricted within the Chemical Weapons Convention where it is classified as a Schedule 1 substance.

Blue Grass Chemical Agent-Destruction Pilot Plant: The Blue Grass Chemical Agent-Destruction Pilot Plant (BGCAPP) is a chemical weapons destruction facility undergoing systemization, or testing.  The plant will destroy the chemical weapons stockpile at the Blue Grass Army Depot (BGAD), near Richmond, Kentucky.  The plant is dedicated to the destruction of 523 ST of nerve agents sarin (GB) and VX, and mustard agent, which constitute about two percent of the United States chemical weapons stockpile.

Blister agent: A blister agent, or vesicant, is a chemical compound that causes severe skin, eye and mucosal pain and irritation.  They are named for their ability to cause severe chemical burns, resulting in painful water blisters on the bodies of those affected.  Although the term is often used in connection with large-scale burns caused by chemical spills or chemical warfare agents, some naturally occurring substances such as cantharidin are also blister-producing agents (vesicants).  Furanocoumarin, another naturally occurring substance, causes vesicant-like effects indirectly, for example, by increasing skin photosensitivity greatly.  Vesicants have medical uses including wart removal but can be fatal if even small amounts are ingested.

Supporting paragraphs: Pueblo Chemical Agent-Destruction Pilot Plant Sulfur mustard
Answer: a chemical weapons destruction facility