3 Apache attack choppers flying through the Columbia River Gorge? What's going on?

Never seen this much military activity in the Gorge National Scenic Area... Just wondering what's going on - Sorry for the Shaky video!
I was just going out to get a quick video of the rainbow and BAM! Five AH-64 Apache helicopters flew by one after the other! I caught 3 of them but missed the first two.

here is the awesome camera I used to take this video:
Fujifilm X-T3 Camera:
https://amzn.to/2WiSWnq

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