This study describes injury rates, injury diagnoses, anatomical locations of injuries, limited duty days, and activities associated with injuries in a sample of Army mechanics. Medical records of 518 male and 43 female Army mechanics were screened for injuries during 1 year at a large U.S. Army installation. Weight, height, age, and ethnicity were also extracted from the medical records. Body mass index was calculated as weight/height2. Overall injury rates for men and women were 124 and 156 injuries/100 person-years, respectively, with a rate of 127 injuries/100 person-years for all soldiers combined. Women had higher overuse injury rates while men had higher traumatic injury rates. Limited duty days for men and women were 2,076 and 1,966 days/100 person-years, respectively. The lower back, knee, ankle, foot, and shoulder involved 61% of the injuries. Activities associated with injury included (in order of incidence) physical training, mechanical work, sports, airborne-related activities, road marching, garrison/home activities, and chronic conditions. Among the men, elevated injury risk was associated with higher body weight and higher body mass index. It may be possible to prevent many injuries by implementation of evidenced-based interventions currently available in the literature.