ISOPREP, or Isolated Personnel Report, is a type of data card for those considered "at risk." It serves recovery purposes for soldiers that would be MIA since it contains their personal information.
For use by recovery forces to identify personell prior to recovery
The purpose of ISOPREP (Individual Service Member's Pre-deployment Training Program) data is to provide critical information about military personnel to ensure their safety and effective recovery in the event of an isolated personnel situation or during a deployment. It includes personal, medical, and contact information, helping to facilitate search and rescue operations and aid in repatriation efforts. ISOPREP data is vital for contingency planning and personnel accountability in the military.
DD Form 1833 Isolated Personnel Report (ISOPREP)