Military sexual trauma, or MST, refers to sexual assault or repeated, threatening harassment experienced during military service. Because these events so often go unreported at the time, the VA applies special, relaxed evidence rules for related claims. This guide explains how those claims work. Please read with care.
What MST is, in VA terms
MST is not a diagnosis. It is an experience. Claims are usually filed for the conditions that resulted from it, most often PTSD, but also depression, anxiety, and related conditions.
The special evidence rule: markers
The VA understands that MST is frequently not reported through official channels. So for MST-related PTSD claims, the VA relaxes the usual requirement to corroborate the stressor with official records. Instead, it allows "markers," indirect evidence that something happened.
Markers can include:
- Records of a request for a transfer or a change in duty assignment
- A sudden drop in performance or disciplinary issues
- Changes in behavior, such as anxiety, depression, or substance use
- Statements from family, friends, clergy, or fellow service members
- Records of visits to a medical or counseling provider, even if the reason was not stated
The VA is required to consider this kind of indirect evidence for MST-related claims, which it would not typically accept for other stressors.
Where a nexus letter and mental health opinion fit
For MST-related PTSD, a mental health provider's opinion is central. It can:
- Connect the current diagnosis to the MST
- Explain how the markers in the record are consistent with the trauma
- State the opinion in VA terms
Because these claims are sensitive and evidence-specific, working with a provider experienced in MST and, ideally, an accredited representative, matters.
Support comes first
If you experienced MST, support is available regardless of whether you file a claim, your discharge status, or how long ago it happened. The VA provides free MST-related care. You do not need a rating or a filed claim to access it.
A real-world example
A veteran filed for PTSD related to an assault that was never officially reported. There was no incident report, but her record showed a sudden transfer request and a documented decline in performance around the same time. A provider explained how those markers were consistent with the trauma and connected the diagnosis to it.