Report from MUFON:
Date of event: March 4, 2010
Location of event: near Riverside, Texas
"On this particular night, I was parking my car after returning home from a friend's house. I generally look up at the night sky anyway, but on this particular night I heard a helicopter approaching from my right. Thinking nothing much of it, I get out of the car and pan my head over in the direction of the helicopter. When I did this, I saw a very large object slowly approach overhead and it looked to me like it was being escorted by a helicopter.
The helicopter was flying directly adjacent to this very large triangular object. I'd say it was about 2-3 football fields in diameter. I saw the 3 bright lights making out the triangular shape, and noticed a very slow, pulsing red light in the bottom of the object. Stunned at what I was seeing, I froze to look at the object in the middle of the street. It was about 6-700 feet above me, flying fairly low and extremely slow for an aircraft that large.
The curious thing about it was that it made absolutely no noise. All I heard the whole time was the sound of the helicopter and nothing else. When the object went straight over my head, I felt a very eerie feeling - like I was being watched at that very moment. After it went overhead and beyond the horizon, it looked like it was heading toward (the direction) of March Air Force Base into the San Timoteo Canyon.
The total event only lasted a few minutes, and I thought it was very interesting that it looked like the helicopter was escorting it."