Which question is least informative when screening a new veteran patient?

When screening a new veteran patient, the question about how long they have been in the military provides limited context about their experiences and potential health risks compared to the other options. Knowing the duration of service alone does not reveal critical information about their specific military experiences, deployment history, or exposure to combat-related stressors, all of which can significantly impact mental and physical health.

In contrast, questions regarding deployment, military occupation (MOS), and any injuries or illnesses can provide valuable insights into the patient's unique experiences. Deployment information can indicate potential exposure to combat situations or environmental hazards. Understanding their specific military role can shed light on unique stresses or health risks associated with that position. Inquiry about injuries or illnesses helps identify any ongoing health issues that may need to be addressed in their care.

Thus, while the duration of service is certainly relevant, it is the least informative question for understanding the veteran's overall health status and specific needs.