The 11th Marine Regiment was "conducting a regimental-size training evolution in order to develop and sustain its ability to plan and execute artillery fires and fire support coordination in support of the 1st Marine Division." That's Leatherneck speak for big shells and big booms.
The exercise took place on the base in North County. Military officials said they were hoping to "put a face on the noise" that residents in Orange and San Diego counties can hear from their homes.
"It definitely has its purpose -- it's one of those things that you don't need it until you need it, and when you need it, these guys have to be trained and ready for that; that's why this training is so important to what we do," said a battalion commander about the equipment his men were training with.