Strange activity

Can anyone explain why there have been Apache helicopters flying around my area for the last few days? I live in West Georgia. I first noticed them on Monday, they were flying very low and in groups of 3 in formation. Several groups passed within 30 minutes heading southwest. Then tonight on the way home from work, I saw a couple flying around solo. Somethings going on...I don't know if it is some kind of drill of whatever, but those damn things are loud and need to stop shaking the house when the fly over.