Los Angeles entered its fourth night of turmoil on June 9, with protests over federal immigration raids morphing into large-scale riots that have torched cars, closed freeways, and injured at least 29 law-enforcement officers. Roughly 2,000 California National Guard soldiers—activated under a presidential memorandum signed late June 7—are now on city streets, and a battalion of about 700 Marines from Twentynine Palms began arriving by airlift Monday evening to reinforce security around federal facilities. The Pentagon says the Marines will remain “in a force-protection role” unless the President invokes the Insurrection Act, which would authorize active-duty troops to perform law-enforcement functions such as arrests.