Video - Phoenix Lights Mystery: UFO or Military Maneuver?

In 1997, thousands of people in Phoenix, Arizona, witnessed a massive V-shaped formation of lights moving silently across the sky. The event remains one of the most well-documented UFO sightings in history. What were these lights? Witnesses described the lights as stationary and then moving in formation. Could they be military flares, or was it something extraterrestrial? The government provided an explanation, but many remain skeptical. Comment your theories below.