Seen from a Navy Ship.

I was in the Navy on board a destroyer going on a 6 month cruise to the Med. there were three ships in our task group and there were many witnesses but cant say who they are except me and my brother plus the CO. of my ship. 
Someone noticed a light in the clear moonless night sky,  It was cigar shape and appeared as if it was a fluorescent light, but hugh… Approx. 45 degree angle from horizon and all I can say about the altitude was it eas approx. 1 mile high.  No sound....after about 45 minutes it left with incredable speed up and at somewhat of an horizontal flight...No aircraft around us and the Captain was baffled at this (phenomenia) also I had never gave much thought to UFO's until that night and now I always look in the sky for another possible look.........
Date of sighting may be approximate, but we are not certain.  PD