MST and PTSD: The Relaxed Evidence Standard

Standard PTSD service connection under 38 C.F.R. 3.304(f) requires a DSM-5 diagnosis, a medical nexus, and credible supporting evidence that the stressor occurred. For most non-combat stressors, this third element requires corroboration beyond the veteran's own testimony. But MST claims operate under 38 C.F.R. 3.304(f)(5), which recognizes that in-service personal assaults are often unreported and undocumented in service records. This subsection uses a fundamentally different evidentiary framework.

The regulation accepts evidence from sources other than service records to corroborate the stressor. VA must consider:

VA may NOT deny a personal assault PTSD claim without first advising the claimant that alternative evidence sources (including evidence of behavioral changes) may constitute credible supporting evidence, and allowing the opportunity to furnish such evidence or identify potential sources. This duty-to-notify requirement is unique to 38 C.F.R. 3.304(f)(5) claims. If VA denied your claim without sending this notice, that denial may contain procedural error.

Section 3.304(f)(1) is the general rule requiring corroborated stressors. Section 3.304(f)(2) allows combat veterans to establish stressors through lay testimony alone under 38 U.S.C. 1154(b). Section 3.304(f)(3), added in 2010, covers "fear of hostile military or terrorist activity" using lay testimony when a VA psychiatrist confirms the stressor. Section 3.304(f)(4) covers POWs. Section 3.304(f)(5) governs personal assault including MST -- using the relaxed evidentiary markers listed above.

In FY2024, VA received 57,400 MST claims (18% increase over FY2023) with a grant rate exceeding 63%. The gap between MST and non-MST PTSD grant rates has narrowed from approximately 24 percentage points in FY2011 to roughly 1 point currently. H.R. 2201 (Improving VA Training for Military Sexual Trauma Claims Act) passed the House unanimously on May 19, 2025, and is pending in the Senate. It mandates annual sensitivity training for all VA employees processing MST claims and requires VA to automatically obtain both medical and personnel records for assault-based claims.

MST claims processing procedures are in M21-1, Part III, Subpart iv, Chapter 4, Section H (PTSD claims based on personal assault/MST). VA has consolidated MST claims into a single MST Operations Center with a senior executive overseeing the workload.

38 C.F.R. 3.304(f)(5) -- Personal assault PTSD evidentiary standard38 C.F.R. 4.125(a) -- DSM-5 diagnostic requirement38 C.F.R. 4.130 -- Mental disorders rating schedule (DC 9411 for PTSD)38 U.S.C. 1154(a) -- Consideration of all pertinent evidence38 U.S.C. 1720D -- MST treatment regardless of dischargeM21-1, Part III, Subpart iv, Chapter 4, Section H -- MST claims procedures