Whenever global tensions rise, discussions about the possibility of a military draft often resurface. While the United States currently operates with an all-volunteer military force, the Selective Service system still exists as a contingency plan if Congress were ever to authorize conscription again. In that scenario, not everyone selected would automatically be required to serve. Medical evaluations play a major role in determining who is eligible.

Before entering active service, individuals chosen through the Selective Service system would undergo a detailed physical and medical examination. The purpose of this process is to ensure that recruits are physically and mentally capable of handling the demanding conditions of military training and operations. If certain medical issues are present, a person may be classified as unfit for service or placed into a non-combat category.

Several health conditions have historically led to exemptions from military duty. Severe heart conditions, for example, can disqualify someone because of the intense physical strain military service often requires. Serious respiratory disorders such as chronic asthma that cannot be controlled with treatment may also result in medical disqualification. In addition, certain neurological or psychiatric conditions that could affect judgment, stability, or reaction under stress may be considered during evaluations.

Other factors can also influence eligibility. Significant vision or hearing impairments, severe musculoskeletal injuries, or chronic illnesses requiring ongoing treatment may lead to deferments or exemptions depending on the severity of the condition. The military’s goal in these assessments is not punishment but readiness — ensuring that those who serve are physically capable of performing their duties safely.

It’s important to remember that the United States has not used a draft in decades, and there are currently no plans to reinstate one. Still, understanding how medical evaluations work within the Selective Service framework helps explain why eligibility rules exist and how they would be applied if conscription were ever considered again.