For this analysis, we quantified the relationship between maintenance manpower investments and H-60 helicopter readiness in the Army National Guard (ARNG). Using causal econometric methods, we found that increasing the number of Military Technician (MilTech) mechanics at ARNG Army aviation support facilities (AASFs) of all sizes reduces helicopter maintenance timelines to a statistically significant extent. We estimated that the addition of a single MilTech mechanic to each ARNG AASF would produce 18 to 31 additional mission capable hours per H-60 helicopter, or 3.2 additional ready helicopter years across the ARNG’s fiscal year 2019 H-60 fleet. These results can help inform decisions about placement of additional MilTech mechanics.