Predicting the Invisible Blast: New Tools to Cut Unnecessary Overpressure Exposure in Training

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New BOP Tool puts real-time overpressure predictions in the hands of range officers.

Introduction:
Service members are repeatedly exposed to low-level blasts from explosives and weapons during routine military training. Even sub-threshold exposures within current occupational limits have been linked to cognitive deficits and long-term brain health risks. Following Section 734 of the FY2018 NDAA, Department of War guidance established blast overpressure (BOP) action thresholds of 4.0 psi (and 2.3 psi for breachers). However, training cadre, range managers, and unit commanders previously lacked accessible, predictive exposure data to proactively plan training events. This project developed and evaluated the multi-platform Blast Overpressure (BOP) Tool to enable military personnel to model, predict, and mitigate unnecessary blast exposure during weapons training exercises.

Study Setup:
Building upon the computational CoBi-Blast framework, investigators engineered and operationally validated three distinct versions of the BOP Tool: An Android mobile application designed for austere field environments, a Windows desktop application featuring dedicated Site and Scene modules, and an ArcGIS-integrated interface for military range managers. The modeling engine simulates blast dynamics across 14 priority heavy-weapon systems using critical operational parameters, including weapon type, ammunition variant, operator posture, crew proximity, and firing schedule. The tool generates color-coded peak-pressure safety contours (green: ‹2 psi; yellow: 2–4 psi; red: ›4 psi) and estimates cumulative regional body doses. Validation was conducted using empirical pencil-probe blast sensor data and Kingery-Bulmash blast physics models, alongside qualitative and quantitative usability feedback from U.S. Army, Marine Corps, Navy, and Special Forces personnel.

Results:
The multi-platform BOP Tool provided fast, actionable exposure assessments across simulated and field training environments. The mobile app delivered immediate blast estimates under field conditions; the desktop Site Module mapped safe observation zones and cumulative exposure values, while the Scene Module visualized three-dimensional blast shockwaves across human avatars. The ArcGIS integration allowed range safety officers to project overpressure contours directly onto digital range terrain maps. Preliminary operational adoption prompted protective behavioral adjustments, such as adopting prone firing postures and maintaining wider separation between firing lines. Validation scenarios demonstrated practical safety planning: a breacher can confirm that a 5-foot stand-off distance maintains exposure below the 2.3 psi threshold, and a range commander can establish an evidence-based 15-foot minimum separation buffer between .50-caliber and SMAW firing positions.

Conclusion:
The BOP Tool translates abstract overpressure safety limits into actionable, scenario-tailored exposure predictions. By enabling training cadre and commanders to simulate operator positions, weapon postures, and firing intervals prior to live-fire exercises, the system advances immediate range safety while protecting long-term warfighter cognitive and brain health. Ongoing and future developments include an iOS application release, modeling of reflective surfaces (such as shoot houses and ship decks), and integration of additional weapon systems.

Figure 1. Example outputs from the three BOP Tool platforms (mobile, desktop Site/Scene, ArcGIS) https://pubmed.ncbi.nlm.nih.gov/42560217/

References:

Enhancing Blast Overpressure Exposure Awareness and Informing Military Training Decisions to Mitigate Unnecessary Exposure. Brokaw EB, Dominijanni A, Garimella HT, Laughrey L, Lalis L, Oliver M, Palmer D, Przekwas A, Spencer R, Scherer M, Gupta R. Mil Med. 2026 Aug 1;191(Supplement_1):401-408. doi: 10.1093/milmed/usag111. PMID: 42560217.

Funding:

This research was supported by funding from the U.S. Army Medical Research and Development Command (MTEC-23-06-USAMRDC-MT-103) and Department of Defense (DoD) SBIR Contract W81XWH21C0043.

Predicting the Invisible Blast: New Tools to Cut Unnecessary Overpressure Exposure in Training

References:

Funding:

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