I picked up my daughter from babysitting-we were talking in the vehical and I looked up seeing lights- resembling those of a helicopter.I took aviation courses and know what these look like- however-there was no sound and it turned suddenly and flew silently and quickly for 4 or 5 blocks (at about 100 feet up)then stopped when I could no longer follow it with the car because of a dead end. It hovered for a minute and quickly flew off toward the airbase-I snapped a picture with my cell phone cam only to reveal that There was another craft close by I did not see until I took the picture and then both crafts just "disappeared" it was a cloudy night and there were no other crafts or stars. The first object I followed did not have typical red or green aviation lights until it turned toward the second craft- this first object was shaped like a cross with only blue lights then turned in a way to reveal 2 red lights (no flashing) and the second craft appeared as a triangle and only had three lights that I can see. I have a picture on my phone if I could send it you could examine it. Please tell me it was a helicopter and small plane! Also last week my family and I were driving along highway 2 at night at midnight and saw a fast moving triangle craft we thought was a plane until it made a straight 75 degree turn and stopped then turned again to duck under low laying clouds-it was completely soundless and only about 250 feet above us. I thought it was the new "aircraft" the base has but I never have seen any aircraft move like this and I did not want to jump to conclusions so I say I did not know what it was-but my 4 kids totally freaked!