I am a 31year army veteran. I was employed as armed security in Qatar. I have years of security experience. At 7:40pm, 27 april 2015 I observed a black lear type jet flying nw at a low altitude. At this time the sun has yet to set behind the mountains to the west. Distance from my location the jet was about 2 to 3 miles. The strange thing about this occurance is that in the 4 corners region of NM there is no airport, at best there is a small plane airstrip(no buildings not even afuel truck) in Shiprock. Due west of our home there is a mountain range that paralels hwy 491 and the Arizona border. Previously, I observed an aircraft flying north, parallel to the mountain range, below the top of the range. Admmittedly this isn't a saucer/triangle observation with greys doing biological sampling. However, black helicopters and men in black are associated with UFOs. Additionally this part of the U.S. has a huge reputation as a UFO hotspot. Was it military? Probably. Having been stationed on Ft Hood I have been exposed to spy planes. They have markings but they aren't all black. Is this noteworthy? I don't know.....maybe.