saw one flashing light in sky similar to aircraft lights on wings, saw 3 other similar lights flashing, all came together as one, took off towards the north. we were near Hanscom air base.

my friends and i were in a field near hanscom air base in bedford ma. looking up at the sky when we noticed a light moving in a zig-zag fashion.  it reminded me of the way a small aircraft's lights strobe.  we noticed that this was not a small craft but a light, moving erratically, with no certain shape to it.  it made no noise whatsoever. we observed this one light for approximately 2 minutes, all of the sudden we saw another light acting the same way, then another light, and then one more light.  at first the lights were far apart in the sky but began to move in closer to each other. we observed all 4 lights merge together as on solid light and take off to the north.  my friends and i could not beleive what we had just seen.  we were totally amazed. we never reported this sighting to authorities, nor do we know of any other witnesses.  i thought it was strange though because we were less than a mile from the airbase.
Date is approximate.  PD