Dozens of American military personnel joined Ecuadorean police in raids, marking a new level of direct U.S. involvementEcuador’s security forces carried out a series of raids this week around the country, killing three alleged drug traffickers and capturing dozens more. At their side was a contingent of heavily armed American soldiers. The operations, which were announced by the Ecuadorean government, signal a deepening of U.S. military involvement in Latin America’s drug wars as the Trump administration pledges to go after criminal groups it has labeled narcoterrorists. On Thursday in the city of Guayaquil and several other locations, 50 U.S. military...