This is a game that I made back in 2000 called eGunnery. At the time we were looking for a way to get some online attention for our Army National Guard unit, so I thought that making a gunnery simulation would help. Check it out, but keep in mind that I made it almost 10 years ago! There are multiple levels, so if you are good enough you will get to continue on. It will no longer keep track of high scores, that data was being stored on a server where I worked at the time, but other than that it seems to still work.