A July 11, 2015 commemoration, at Flushing Meadows-Corona Park, in New York City’s borough of Queens, helps mark the 75th anniversary of the July 4, 1940, bomb explosion that killed two NYPD bomb detectives and gravely injured four others. The 30-minute service, which drew more than 100, highlighted the bomb’s impact on the families of the men called to defuse the threat, as well as on police protocols in handling bomb threats.