The military allows people with flat feet to join. Flat feet were once a cause for concern because it was believed that people with flat feet were less tolerant of foot stress.
Military studies concerning flat feet and injury have been unconvincing in the past, stating that flat feet are not necessarily a hindrance in service according to military.com. This is especially true in people who are of legal age to join the military and have never had any prior problems with their feet. Nevertheless, a recruit with flat feet may be disqualified for service at the military entrance processing station (MEPS) if the assessor decides that the person's flat feet may become an issue.