MIAMI GARDENS, Fla.—A slain FBI agent was remembered for her strength, infectious laugh, love of family and commitment to protecting children during a memorial service Saturday. Agents Laura Schwartzenberger, 43, and Daniel Alfin, 36, were gunned down Tuesday while serving a search warrant at the Broward County home of a child pornography suspect. The service for Schwartzenberger was held at the Miami Dolphins’ football stadium. A separate service for Alfin will be held there Sunday. “There are no good words to make sense of a loss like this, no good words for a day like Tuesday, or like today,” said FBI Director Christopher Wray. “There’s a heaviness in our hearts and a burden unlike any other, because there is nothing more devastating to the FBI family than the loss of an agent in the line of duty.” Schwartzenberger’s casket was draped with an American flag as it was brought out …