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Historically, the route from injury to definitive care was quite prolonged. Level 1 care provides only minimal resuscitative or stabilization capability. Evacuation to a Level 2 field hospital capable of further stabilization could take up to a day and is termed Casualty Evacuation. Furthermore, it could take up to a week to get to a facility with significant surgical subspecialty capability such as a Level 3 theater hospital. This evacuation is called tactical evacuation. These facilities while transportable were large requiring significant airflow to move and were slow to build up and take down. Hence, as the conflict progressed and the front line moved, the distance from the point of wounding to Level 3 care could become quite significant. Finally, it could take up to two weeks to get someone out of theater to a Level 4 definitive care facility. Survival from significant injuries was difficult with this timeline.