I was inside the house and heard loud aircraft. went outside and saw 3 of the 4 ospreys (rotors in helicopter position) that flew over from north to south. about 15 minutes later i heard them coming back from south to north. three passed over the house, the fourth made a fairly quick bank and turn around and head south. i had my son come with me and jumped in the car to see where it was going. by the time we got in the car and went over the hill the osprey was coming back north a couple hundred yards in front of us at about 400-500 ft altitude we saw a tiny bright white light in front of the osprey, as it passed over us there were two lights and one darted wast at a 90 degree angle and went out of sight, the other went east a second or so after the first one and the 2nd one darted east and the osprey went in that direction over the ridge and out of sight. the ospreys fly over this area all the time but it is very rare they do after dark. i figured this was something they (army) have or use but the speed and physics were pretty fast compared to today's drones, especially in 2015.