The U.S. Navy sank the Belleau Wood during the RIMPAC 2006 exercises. Not that a 39,000-ton ship with the ability to hold over 40 helicopters couldn't be useful for things like prepositioning forces or capable of serving longer with an overhaul... but for some reason, she was sent to the bottom.
Apparently, if reports are correct, the Navy also put the Valley Forge on the bottom - a ship that was roughly 20 years old, and retired two years ago. You think selling a ship with a high parts commonality with the Kidd-class destroyers to Taiwan would have been a good idea.
Not only is the Navy throwing away valuable stuff, they don't even look for better deals than scuttling the ship.