My friend and i would outside assessing an upcomming landscaping project when we looked up due to the sound what looked like a blackhawk helicopter fairly low, but not unusually low. at the same time, much higher than that was a commercial aircraft heading west, most likely in the landing pattern for bwi airport about 50 miles to the south. somewhat between the helicopter and the airliner was this redish / orange object that seemed to be barely moving and appeared to be at a higher elevation than the helicopter, but is difficult to say for sure.......Clear sunny day. as the helicopter approached (flying south to north) the object turned towards the w/nw and accelerated out of sight at a remarkable speed (no sound). the helicopter didn't appear to turn, but was somewhat heading in a nw direction already. within 15 seconds of the getting out of sight a small black (loach like) helicopter came from a se direction headed in the same direction of the object. the second helicopter was about the same altitude as the first helicopter....Not unusually low, but low enough to make plenty of noise and to identify its type. both of us were extremely puzzled as to what we just witnessed. this happened about 90 minutes ago. as the object flew away it became very thin, almost like a thin line on the sky, but still completely visible. the speed at which it traveled was incredible and was past the horizon and out of view within 3 - 5 seconds.