My girlfriend and I had driven up to the church in the sierra vista mlountains to watch the sun set, we left at arount 5 to the mountains, we arrived and spent time there and after the sun set we sat on a bench right outside the church, the church sits half way up this small mountain, we were over looking the city of sierra vista, at around six thirty or seven, I can't recall the exact time, we both were looking up at the stars when we noticed the sky on the left getting darker to where it blocked off the stars, this object was massive in size and it hovered over us, my girlfriend was scared when she saw this and I was nervous, the object made a noise like a propane stove burning would make when you lit it, the object moved at a slow pase like it was just floating through the air, it moved passed us and as it did it muted all noise from the traffic on the highway below the mountain and all the crickets were also silent, it was quiet except for the noise coming from the object, the object was a large traingle shape with 3 lights on the tips and lights on the bottom, my girlfriend said she also noticed other lights along it which I did not, the object headed northeast and as it passed over us a smaller light detached it self from it and headed north towards the town of sierra vista, we watched both objects and watched them go into the distance, the smaller object then stopped at what it seemed to be the middle of the town and released a bright red strobe like sphere that went into the town and dissapeared, I called my sister, who lives in sierra vista also, right after this happened to see if she had seen anything in town or in the sky, she had not, a few minutes after this two jets flew out of fort huachuca in the direction of the larger object, I had my cell phone with me and it has a camera, I did not take video or pics of this, I did not think of that at the time, I have never seen anything like this before and even though i have always had an interest in the subject, this is the first time I have experienced something like this to where I have a hard time believing it myself, I am just glad my girlfriend witnessed it with me. I had told every one i met of this event and most have laughed and I wanted to come fort only because I want to learn more and I want others to also share their experiences, thank you.