This study analyzed the effects of low-level blasts on military personnel through a survey of veteran mortarmen (N = 50). The mortarmen responded to screening assessments measuring depression, PTSD, anxiety, and alcohol use disorder. Through a matched case-control study design, surveyed mortarmen were compared to the control group consisting of veterans who had suffered one or more mTBIs (N = 1301). Regression modeling found that mortarmen reported higher PHQ-9 scores than controls. Even controlling PCL-5 scores as a covariate, mortarmen still reported higher PHQ-9 scores, suggesting PTSD was not the only factor responsible for worse mental health symptoms. Results suggest that the surveyed mortarmen had comparable or worse mental health outcomes when compared to veterans who had suffered a mild traumatic brain injury. Further work is needed to comprehensively study the affected population and determine if a link exists between cumulative blast overpressure and mental health, irrespective of reported traumatic brain injury.