The Lincoln Boulevard Defensive Line was a USMC Defensive Line used for casevacs and for defensive purposes against the alien visitors during the Battle of Los Angeles. It included a Casevac point-defense line, which included infantry and ground vehicles on sentry for civilian and military extraction and Casevacs. It also included a Command Post where Officers and senior officials could command and control their units from there, as well as organize missions and assaults on enemy alien positions.