2023 Ranch Hand Study to DVA email 15/09/26
On 15 September 2026, I submitted the evidence directly to:
Luke Brown, First Assistant Secretary, Policy & Research;
Cath Haffner, Assistant Secretary, Health & Wellbeing Policy;
Kerrie Martain, Assistant Secretary, Rehabilitation & Families;
Annabelle Wilson, Veteran Family Commissioner.
Dear Mr Brown, Ms Haffner, Ms Martain and Commissioner Wilson,
I am submitting two 2023 peer-reviewed studies as evidence for consideration in DVA’s current examination of the Sons and Daughters of Vietnam Veterans program and its research into intergenerational impacts of service.
Both were published in Reproductive Toxicology and analyse data from the US Air Force Health Study (Ranch Hand Study), including measured paternal dioxin levels.
An analysis of birth defects and developmental disabilities for children of participants of the Air Force Health Study
An analysis of reproductive outcomes for conceptions of participants of the Air Force Health Study
George J. Knafl, Reproductive Toxicology, 2023, Volume 119, Article 108413
The first study analysed birth defects and developmental disabilities among children fathered by participants in the Air Force Health Study.
It found:
“For each of the eight general categories of birth defects and developmental disabilities, the probability of its occurrence increased substantially for children conceived after compared to before the start of Vietnam War service.”
For seven of the eight categories, the estimated dose-response curves increased after identified thresholds in veterans with measured dioxin levels. The study concluded that the adverse effect:
“may be attributable to high enough exposures to dioxin”
The second 2023 study analysed reproductive outcomes from the Air Force Health Study.
It found increased miscarriage, preterm birth and pregnancies not resulting in a live birth following paternal Vietnam service. Using measured dioxin levels, the study concluded:
“adverse Vietnam War effects on reproductive outcomes for conceptions is attributable to dioxin exposures larger than a relatively small threshold.”
Now compare these findings with the evidence I have attached.
My father, William Christopher Pitcher, was an Australian Army Plant Operator who served in Vietnam in 1969–70.
I was conceived after his Vietnam service and born in November 1974. My Queensland birth certificate identifies William Christopher Pitcher, occupation “Soldier”, as my father.
I have multiple congenital, structural and neurological abnormalities. My attached medical records document extensive spinal and neurological abnormalities, including scoliosis, neuropathic symptoms and radiculopathy, as well as a transitional lumbosacral vertebra, lumbarisation of the first sacral piece, a diminutive right sacral ala and a rudimentary S1/S2 disc space.
My mother then suffered a miscarriage in approximately April 1975.
The parallel is difficult to ignore:
Plant Operator father serving in Vietnam → daughter conceived after service with multiple abnormalities → subsequent maternal miscarriage.
These studies do not rely solely on veterans recalling or believing that they were exposed.
The dose-response analyses used measured paternal dioxin levels.
I therefore request direct answers to four questions:
Have these two 2023 studies been formally assessed by DVA?
Have they been considered against the physical-health data collected from sons and daughters in Australia’s Vietnam Veterans Family Study?
Have they been provided to those currently examining the Vietnam Veterans’ Sons and Daughters Support Program?
If they have not been assessed, who within DVA is responsible for ensuring that they are now assessed?
I am asking DVA to explain what it has done with contemporary peer-reviewed scientific evidence reporting the same categories of reproductive, developmental and offspring harm that Australian Vietnam veterans’ families have been reporting for decades.
Attached are my father’s Australian Army Record of Service, my Queensland birth certificate and medical records documenting my physical conditions.
I request a written response addressing each of the four questions above.
These studies should also be considered alongside recent United Nations work addressing the intergenerational impacts of toxic remnants of war, the manufacture or exploitation of scientific uncertainty, and the continuing international examination of toxic exposure and human rights.
Section 3: “Tactics for Manufacturing Doubt”
Warm Agent Orange Burns regards,
Danielle Stevens (née Pitcher)
Geneva AP1 Article 77
We will always be a child of a Vietnam Veteran
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