The 9-liner is a standard format used by medical personnel in combat situations to request casualty evacuation (CASEVAC) for an injured soldier. It consists of 9 lines to report critical details like the casualty's location and condition to initiate prompt medical evacuation. Initiating a 9-liner request is an important part of tactical medicine, which provides different levels of care under fire, on the tactical field, and during evacuation from a hostile environment. The 9-liner format varies slightly between organizations but generally includes information like the pickup location, radio contact details, patient priority level, and hazards like contamination.