From 1999 to 2017, 38,942 US children ages 5 to 18 years old were killed by firearms, averaging more than 2,000 deaths a year. In 2017 alone, 2,462 school-age children were killed by firearms compared to 144 police officers and 1,000 active military worldwide who died in the line of duty. The study finds significant increases that began with an epidemic in 2009, followed by another one in 2014. Each of these epidemics has continued through 2017.