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The late-night booms reported around Jefferson and Bullitt counties Monday and early Tuesday were from Fort Knox, a post spokesman said.
A Marine Corps unit at the base training at night, said Ft. Knox spokesman Kyle Hodges.
The unit could continue its training through the end of Thursday but they should be done on Wednesday, he said.
The noise caused by late-night training can be an annoyance for nearby residents, but it is important for the Marines because they are going to see nighttime action and their response in that kind of situation is very different than it would be during the day, Hodges said.
The unit is trying to keep the noise from continuing too late into the night and morning, he added.
“It should be done by midnight each night,” he said.
Reporter Mark Boxley can be reached at (502) 582-4241 or on Twitter at @Boxleyland.