Noticed two (2) flashing white strobe lights in the sky traveling from North to South at a high rate of speed.

My wife and I had just gotten out of our Hot Tub and were relaxing on our deck looking up at the stars. I noticed a very bright white strobe light flash rapidly three times in the sky to my left and then go dark for approximately one second. There was no noise and I did not make out any shape. The next time they flashed it was in a different place as if the object was moving at a high rate of speed. We watched it for four of five more seconds and then it made an abrupt turn and appeared to travel up and then a moment later abruptly turned again and traveled down. We lost sight of it behind some trees. As we were discussing it a second one appeared in approximately the same location as the first and traveled the same path displaying the same mannerisms. I'm a retired Aviation Marine and have worked with military aircraft for twenty years and have never seen anything to compare with this. What stunned me was that when the light flashed three times I could see each separate flash ( it would be about the same amount of time to send the letter "S" Morse Code) that would indicate that whatever they were, they were traveling at a very high rate of speed. We sat there and continued to watch the sky for another thirty five to forty minutes and didn't see anything else except a few commercial aircraft at altitude.