Exploring the impacts of tactical vest load mass on the relationship between balance control capability and rifle marksmanship in soldiers

This study investigated how varying masses of combat items attached to tactical vests moderate the relationship between soldiers' balance control capability and rifle marksmanship performance. Four load mass levels (2.5, 5, 7.5, and 10 kg) were tested. Participants' postural sway was recorded during an upright standing task using a force plate, and their rifle marksmanship performance was measured in two postures using a mock-up rifle with an optical sensor. Correlation analyses were conducted to assess the relationship between postural sway and rifle marksmanship performance at each load level. Correlations between postural sway and rifle marksmanship performance measures generally increased and became more frequently statistically significant with heavier loads. These findings indicate that balance control capability is closely associated with military rifle marksmanship, particularly under heavier load conditions. Training programs and devices that improve balance control could significantly enhance soldier lethality and contribute to military operational success.