What is Agent Orange?
Agent Orange was an herbicide used in Vietnam to defoliate plants and trees that provided cover for the enemy. The name “Agent Orange” came from the orange stripe on the 55-gallon drums in which it was stored.
There is so much information available about Agent Orange it's not possible for me to list it here.
Agent Orange on Wikipedia
Below are some of the thousands of resources I use to keep up with this constantly changing landscape of knowledge about America's use of the chemical Dioxin.
I've done the Google searching for you. If you need more, I suggest that you begin to search Google yourself.

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If you're ready to do some serious reading and research, click on one or all of these links here:
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The Orange Stripe
The Alvin L.Young Collection On Agent Orange
The VA web site has an extensive collection of helpful data about herbicides. Click here.
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Agent Orange
The
National Academies Press publishes the reports issued by the National Academy of Sciences, the National Academy of Engineering, the Institute of Medicine, and the National Research Council.
Hundreds of titles in electronic Adobe PDF format can be downloaded for free by the chapter or the entire book, or you may purchase them via the web site.
These are serious studies for the veteran who is serious about researching a particular topic.
Agent Orange is the name of a specific blend of herbicides used during the Vietnam era. The military sprayed millions of gallons on trees and vegetation that provided cover for enemy forces.
Some Vietnam-era Veterans were exposed to these herbicides. Learn how Veterans may have been exposed to Agent Orange and other herbicides during military service, including outside Vietnam.
VA and many other government departments and agencies have conducted research studies on the possible health effects of Agent Orange exposure on U.S. Veterans.
VA has recognized certain cancers and other diseases related to Agent Orange exposure. Veterans, Veterans' children and survivors may be eligible for compensation benefits for these diseases and health care benefits.
Veterans and Agent Orange
Blue Water Navy and Agent Orange

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The Agent Orange Registry
38 USC 1116 - Presumptions of service
connection for diseases associated with exposure to certain herbicide
agents; presumption of exposure for veterans who served in the Republic
of Vietnam
Legal Research Home > US Code > Veterans' Benefits > 38
USC 1116 - Presumptions of service connection for diseases associated
with exposure to certain herbicide agents; presumption of exposure for
veterans who served in the Republic of Vietnam
Sec. 1116.
Presumptions of service connection for diseases associated with exposure
to certain herbicide agents; presumption of exposure for veterans who
served in the Republic of Vietnam
(a)
(1) For the purposes of section 1110 of this title, and subject to section 1113 of this title—
(A)
a disease specified in paragraph (2) of this subsection becoming
manifest as specified in that paragraph in a veteran who, during active
military, naval, or air service, served in the Republic of Vietnam
during the period beginning on January 9, 1962, and ending on May 7,
1975; and
(B) each additional disease (if any) that
(i) the
Secretary determines in regulations prescribed under this section
warrants a presumption of service-connection by reason of having
positive association with exposure to an herbicide agent, and
(ii)
becomes manifest within the period (if any) prescribed in such
regulations in a veteran who, during active military, naval, or air
service, served in the Republic of Vietnam during the period beginning
on January 9, 1962, and ending on May 7, 1975, and while so serving was
exposed to that herbicide agent,
shall be considered to have been
incurred in or aggravated by such service, notwithstanding that there is
no record of evidence of such disease during the period of such
service.
(2) The diseases referred to in paragraph (1)(A) of this subsection are the following:
(A) Non-Hodgkin’s lymphoma becoming manifest to a degree of disability of 10 percent or more.
(B)
Each soft-tissue sarcoma becoming manifest to a degree of disability of
10 percent or more other than osteosarcoma, chondrosarcoma, Kaposi’s
sarcoma, or mesothelioma.
(C) Chloracne or another acneform disease
consistent with chloracne becoming manifest to a degree of disability of
10 percent or more within one year after the last date on which the
veteran performed active military, naval, or air service in the Republic
of Vietnam during the period beginning on January 9, 1962, and ending
on May 7, 1975.
(D) Hodgkin’s disease becoming manifest to a degree of disability of 10 percent or more.
(E)
Porphyria cutanea tarda becoming manifest to a degree of disability of
10 percent or more within a year after the last date on which the
veteran performed active military, naval, or air service in the Republic
of Vietnam during the period beginning on January 9, 1962, and ending
on May 7, 1975.
(F) Respiratory cancers (cancer of the lung,
bronchus, larynx, or trachea) becoming manifest to a degree of
disability of 10 percent or more.
(G) Multiple myeloma becoming manifest to a degree of disability of 10 percent or more.
(H) Diabetes Mellitus (Type 2).
(3)
For purposes of this section, the term "herbicide agent" means a
chemical in an herbicide used in support of the United States and allied
military operations in the Republic of Vietnam during the period
beginning on January 9, 1962, and ending on May 7, 1975.
(b)
(1)
Whenever the Secretary determines, on the basis of sound medical and
scientific evidence, that a positive association exists between
(A) the exposure of humans to an herbicide agent, and
(B)
the occurrence of a disease in humans, the Secretary shall prescribe
regulations providing that a presumption of service connection is
warranted for that disease for the purposes of this section.
(2) In making determinations for the purpose of this subsection, the Secretary shall take into account
(A) reports received by the Secretary from the National Academy of Sciences under section 3 of the Agent Orange Act of 1991, and
(B)
all other sound medical and scientific information and analyses
available to the Secretary. In evaluating any study for the purpose of
making such determinations, the Secretary shall take into consideration
whether the results are statistically significant, are capable of
replication, and withstand peer review.
(3) An association between
the occurrence of a disease in humans and exposure to an herbicide agent
shall be considered to be positive for the purposes of this section if
the credible evidence for the association is equal to or outweighs the
credible evidence against the association.
(c)
(1)
(A) Not
later than 60 days after the date on which the Secretary receives a
report from the National Academy of Sciences under section 3 of the
Agent Orange Act of 1991, the Secretary shall determine whether a
presumption of service connection is warranted for each disease covered
by the report. If the Secretary determines that such a presumption is
warranted, the Secretary, not later than 60 days after making the
determination, shall issue proposed regulations setting forth the
Secretary’s determination.
(B) If the Secretary determines that a
presumption of service connection is not warranted, the Secretary, not
later than 60 days after making the determination, shall publish in the
Federal Register a notice of that determination. The notice shall
include an explanation of the scientific basis for that determination.
If the disease already is included in regulations providing for a
presumption of service connection, the Secretary, not later than 60 days
after publication of the notice of a determination that the presumption
is not warranted, shall issue proposed regulations removing the
presumption for the disease.
(2) Not later than 90 days after the
date on which the Secretary issues any proposed regulations under this
subsection, the Secretary shall issue final regulations. Such
regulations shall be effective on the date of issuance.
(d) Whenever a disease is removed from regulations prescribed under this section—
(1)
a veteran who was awarded compensation for such disease on the basis of
the presumption provided in subsection (a) before the effective date of
the removal shall continue to be entitled to receive compensation on
that basis; and
(2) a survivor of a veteran who was awarded
dependency and indemnity compensation for the death of a veteran
resulting from such disease on the basis of such presumption shall
continue to be entitled to receive dependency and indemnity compensation
on such basis.
(e) Subsections (b) through (d) shall cease to be effective on September 30, 2015.
(f)
For purposes of establishing service connection for a disability or
death resulting from exposure to a herbicide agent, including a
presumption of service-connection under this section, a veteran who,
during active military, naval, or air service, served in the Republic of
Vietnam during the period beginning on January 9, 1962, and ending on
May 7, 1975, shall be presumed to have been exposed during such service
to an herbicide agent containing dioxin or 2,4-dichlorophenoxyacetic
acid, and may be presumed to have been exposed during such service to
any other chemical compound in an herbicide agent, unless there is
affirmative evidence to establish that the veteran was not exposed to
any such agent during that service.
VA Publishes Final Regulation to Aid Veterans Exposed to Agent Orange in Korea
WASHINGTON – Veterans exposed to herbicides while serving along the demilitarized zone (DMZ) in Korea will have an easier path to access quality health care and benefits under a Department of Veterans Affairs (VA) final regulation that will expand the dates when illnesses caused by herbicide exposure can be presumed to be related to Agent Orange.
“VA’s primary mission is to be an advocate for Veterans,” said Secretary of Veterans Affairs Eric K. Shinseki “With this new regulation VA has cleared a path for more Veterans who served in the demilitarized zone in Korea to receive access to our quality health care and disability benefits for exposure to Agent Orange.”
Under the final regulation published today in the Federal Register, VA will presume herbicide exposure for any Veteran who served between April 1, 1968, and Aug. 31, 1971, in a unit determined by VA and the Department of Defense (DoD) to have operated in an area in or near the Korean DMZ in which herbicides were applied.
Previously, VA recognized that Agent Orange exposure could only be conceded to Veterans who served in certain units along the Korean DMZ between April 1968 and July 1969.
In practical terms, eligible Veterans who have specific illnesses VA presumes to be associated with herbicide exposure do not have to prove an association between their illness and their military service. This “presumption” simplifies and speeds up the application process for benefits and ensures that Veterans receive the benefits they deserve.
VA encourages Veterans with covered service in Korea who have medical conditions that may be related to Agent Orange to submit their applications for access to VA health care and compensation as soon as possible so the agency can begin processing their claims.
Individuals can go to website http://www.vba.va.gov/bln/21/AO/claimherbicide.htm to get a more complete understanding of how to file a claim for presumptive conditions related to herbicide exposure, as well as what evidence is needed by VA to make a decision about disability compensation or survivors benefits.
Additional information about Agent Orange and VA’s services for Veterans exposed to the chemical is available at www.publichealth.va.gov/exposures/agentorange.
The regulation is available on the Office of the Federal Register website at http://www.ofr.gov/.