Marine sees ufo come down out of sky, travel across bay, and shoot up back into sky in Ewakuni Japan, June 1965.

I was on guard duty on the causeway in Ewakuni Japan.  It was just after the sun went down behind me, I was walking around some boxes on the wharf when I saw what appeared to be a bright light coming down from the sky on my left.  It leveled off over the water and slowly crossed in front of me, going from left to right over the water of the bay.  I could hear water striking the hull of the object as it went very low across the water.  There was no sound other than the water hitting the object, I could hear no engine noise at all. I could not see a shape as it was dark and I could only see what appeared to be a bright light.
I estimate that it traveled perhaps 300 feet across the water. It then went up at approximately a 45 degree angle straight into the sky.  I watched it until it was so small that it appeared to be one of the stars.  I was completely astounded, and just stood there a moment looking into the sky.
I finally ran into a nearby building and called the Officer on duty to report what I had seen.
The operator on the phone told me that I had not seen anything, and told me to forget it, as I would be in big trouble if I said anything further. I hung up the phone and never told anyone else about it because I thought I would be called a kook.
I know what I saw was not a weather balloon, or a helicopter, and I have never seen a craft that could go straight up into the sky as fast as this thing did. I was in the Marine Corps air wing at the time and was used to seeing jets take off. I have never seen a jet fly without making any noise at all, so this in my opinion was not a jet either. I simply do not know what it was.
I have never forgotten that moment. The reason I am reporting it now is because I just got through watching seeing is believing on tv, I don't feel so stupid telling my story now.  I cannot prove my story, so I don't expect people to believe me.  I only know what I saw.