8 to 10 White Lights moving slowly in formation near Prescott Valley AZ viewed from Paulden AZ

Last night, on Thursday Night, at approximately 9:55 pm, until 10:05 pm, 6/15/17, my Wife and I took our Dog out before calling it a night.  I also contacted my parents who live about 4 miles East of me and they also saw the lights.  I called my neighbor that was with me last week and he also saw them this time as well.  We noticed some strange lights to the South South East of our area fairly low in the horizon.  
At first we noticed Eight white lights moving slowly up and down separately from each other and within about 1 minute the number had increased to Ten.  This lasted about 10 minutes.  The lights looked to all be individual and moved slowly in an up and down pattern as well in opposite directions.  They also got brighter and dimmer as the event was happening.  
The lights appeared to be about 20 to 25 miles in the distance and looked to be over the Prescott Valley to Dewey cities from our position in Paulden.  This was very similar to my report from last week exce! pt the lights appeared to be getting bright to dim much faster.  At approximately 10:05 the lights started to fade and headed in a Southerly  direction and slowly vanished from our view.  I did take a couple of photos with my cell phone camera and I will try to forward with the report.   
I am a bit more skeptical about whether or not  this could have been some sort of a military operation since it was so similar to what I saw last week?  Although the white lights had no sign of navigational green or red lights that one would expect of aircraft.