Chain of visibly ascending red dots, perfect line, changing speed and overlapping each other like geese in a flock. Faded out into?

I'm a UPS Driver. Delivering in this area, my helper and I were on our way back to the truck. This area has no light pollution, the sky is incredibly clear. She says, "Omg do you see that?" And I look up and just kept saying "WTF" over and over. Perfect line of 20-30 red dots, speeding up and slowing down overlapping each other like geese in a flock like I said in the summary. Whatever it/they were, they were ascending, approximately a 40 degree angle from our position. While continuing the ascent speeding up and slowing down overlapping one by one dimmed and vanished as if getting too far up to see anymore. The positions in the line were not graduated. I worked in aviation as an active duty Marine and I've never seen anything like it, its notable that there was no sound. The only way I can describe the speed is like the speed of an F-18 in burn, but the massive drops in speed to return to the rest of line's speed was shocking. Unidentified fliers to me, but I'm not familiar with the F-35 capabilities, could have been some training op? The fading out was turning off burn? Shrugs, but I find it ridiculously unlikely for that many to be in one place. The spread of this line in the sky was about the size of an outstretched man's hand, pinky to thumb. Accounting for whatever altitude these things were, that's a massive distance to be doing those maneuvers over. All we could say to each other when they all disappeared was, "Noones going to believe us." I tried to get it on video as we witnessed it over about 30 seconds, cell cam wouldn't pick up the light. Probably just one of those things 2 people saw and will never have an answer for.