LAYTON, Utah (AP) -- For residents around Hill Air Force Base, it would be hard not to notice sirens, smoke and explosive sounds starting Monday for three days.
It's nothing to be worried, about, however.
The U.S. Air Force says it's holding an operational readiness exercise for all service members at the base.
Airmen will be required at times to don chemical-protection gear and gas masks and to take cover.
Hill officials say this kind of training is routine at various times of the year.
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