Firefly?

After a late dinner, I stepped out the back door to smoke a cigarette, like normal.  As usual, I looked up to what aircraft was flying over and from where.  A light caught my eye to the northwest.  At first, I thought it was a helicopter, until the lights started to flash and the flight pattern was extremely erratic.  So then, I thought it might be a firefly, until I realized that fireflies don't changed colors when it began to alternate between white, red, and green.