moved from outer space into lower atmosphere at rapid speed...

Unknown object appeared to move from outer space into lower atmosphere at rapid speed.
Object also appeared to be linear in nature, resembling an octogonal kite configuration.  The object did not seem to emit light, rather, it appeared to be reflecting a directed beam which was directing its course.  The object seemed to be corrected in course by the beam, or some other unseen power source. (There was no visible beam of light or energy).
 This object descended at a 90 degree perpendicular angle over Granite Mountain in eastern San Diego County, and then made a slow calculated inclination to the west between North Peak Mountain and Pine Hills, and then disappeared into an early summer cloud bank. The speed and direction of the object would have placed it over Miramar Naval Air Station in approximately 1 minute.
 This object was and is an enigma to me and the other witness present. I am an Air Force veteran, and have never seen or experienced anything like this. I and the other witness are both ex CDF fire fighters and know eastern San Diego County very well. We both grew up in the mountains of San Diego County, and have watched Top Gun naval air- craft all of our lives. I have no rational explanation for this event. Is the Navy up to something, or what????  If they are, they're damn good!!!!  Geee ellll
Witness appears to us to have very strong credentials, and we suspect he is an excellent witness.  PD