UFO Sighting in Los Angeles, California on June 30th 2014 – Large craft with many smaller craft enterting and leaving it.

I was working in my backyard and decided to take a break and laid down on the cool driveway. Scanning the sky I saw what looked like a giant craft with many smaller craft entering and leaving it. I thought perhaps there was some sort of engagement happening because of the behavior. The large craft seemed stationary and as the Earth moved, so did it as it fell into the horizon. I recall thinking that I'm really surprised there is no reaction to what I was seeing. Meaning our military or ??