Anyone else in Phoenix See the Military Helicopters?

Hi all and Happy Saturday! I am posting this because I found it odd. At 12:34 AZ time (which is either Mountain or Cali time, I don't remember, since we don't change) I heard a rumbling and looked out my window and saw 4 military helicopters heading north over Camelback Mountain. They were close enough to make my windows shake.

The reason this is not too strange is that there is a National Guard Reserve not too far from me. The reasons it is a little strange is that I usually notice the helicopters at night- I assume they train then. And it is usually not that loud, and it's only one helicopter.

Chances are it was just a training mission. But I thought I would post it in case soemthing happens. Maybe there are more UFO's in the Phoenix Sky today.