Perfectly normal activities.
Sometimes they fly similar profiles over land.
You will see them flying patterns like this pretty much anywhere around the continental US.
Primary areas are Seattle, E & W Florida coasts, the gulf particularly around Pensacola, and the channel islands area off the California coast.
Check out some of the weblinks in posts in this bread for more info about the planes & military training areas.
Posts with important training info are generally headlined with bold red titles.
One of my fellow planefags created a cadet badge here feel free to use it >>1318216
Welcome aboard.