COWAC curated content on Blast Overpressure Science & Legislation

By Timothy J. Grossman, President

Coverage window: September 21–28, 2026

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This week at a glance: No major new blast-overpressure findings or legislative votes broke specifically within Sept 21–28. The most recent notable science items are a DoD cohort study confirming elevated TBI and hearing-injury rates in blast-exposed occupations (published Sept 1) and reporting on a new Pentagon cumulative-exposure monitoring pilot (early Sept). On the policy side, H.R. 9237 (TCAVA) saw no new committee or floor action this week. It remains stalled where it was left in mid-July, but the VA’s own tinnitus/sleep-apnea rating rule (the regulatory analog to TCAVA Section 108) faces a September 30 deadline to finalize, worth watching over the next few days.

Science & Research

• DoD cohort study: 43% higher TBI, 39% higher hearing-injury rates in blast-exposed occupations. MSMR analysis of 831,050 high-risk vs. 2.2M low-risk active-component service members, 1990–2024; mental-health/hypertension rates were similar or lower in high-risk groups (“healthy warrior effect”). Published Sept 1, 2026.
  health.mil – MSMR Blast Overpressure study
• Pentagon piloting cumulative blast-exposure monitoring program. Shifts focus from single major explosions to repeated low-level exposure from routine weapons firing; new web-based cognitive assessment tool, baseline + reassessment every 5 years, starting with high-risk specialties. Reported early Sept 2026.
  Federal News Network – Pentagon blast exposure monitoring
• Background (not new this week): “When the Fuse Is Lit” (Military Medicine, ~Aug 2026) linked repeated occupational blast exposure to elevated anger, aggression, and violence risk in veterans, drawn from millions of clinical records — still drawing press coverage into September.
  Military Medicine – blast exposure & aggression study

Legislation & Policy

VSO’s split over Section 108 continues to shape the standoff. Veterans for Common Sense (Sept 4, 2026) reiterated opposition to Section 108’s benefit cuts and other offset provisions. The American Legion continues to back the full 60+ provision package, arguing individual pieces (including Sec. 310/311) can’t easily pass on their own – a likely factor in the continued floor-vote delay.
Veterans for Common Sense – TCAVA statement · American Legion – TCAVA position

STANDING ITEM – H.R. 9237, “Take Care of America’s Veterans Act” (TCAVA): No status change this week. The bill remains where it was left after the House postponed further proceedings on July 16, 2026 (following a recommittal motion that failed 210–211); Speaker Johnson said it would return “in September,” but no new floor vote or committee markup has occurred as of Sept 28. Senate companion S. 4744 is likewise stalled.

Our position: SUPPORT Section 311 which directs the task force to recommend clear frameworks to Congress on how VA claims processors should evaluate evidence linking low-level blast exposure to long-term conditions, making it easier for impacted veterans to receive service-connected disability ratings, and Section 310 “repetitive low-level blast exposure”, into the Precision Medicine for Veterans Initiative; OPPOSE Section 108 restructuring tinnitus and obstructive sleep apnea disability ratings as a $38–57B budget offset.

No news this week suggests any of these three sections have been amended, stripped, or split from the bill. The only floor amendment adopted (Rep. Bost’s manager’s amendment, July 2026) was technical/numbering-only and did not touch substance.
Congress.gov – H.R. 9237 · House Rules Committee · Military Times – bill pulled before vote

VA may finalize tinnitus/sleep-apnea rating rule outside TCAVA by Sept 30 deadline. VA had targeted end-of-FY2026 (Sept 30) to finalize proposed rules changing how tinnitus and sleep apnea are rated – the same substantive change TCAVA Section 108 would legislate. As of September 1st, the rule remained proposed; VA said “no changes are planned or imminent” without further revisions. Separate regulatory track from H.R. 9237, but bears directly on whether Section 108 stays necessary in the bill – worth close watching over the next few days.
Newsweek – VA deadline on disability benefits