The Los Angeles-class is a vaunted nuclear-powered fast attack submarine also known as the 688 class. The original 688 class was constructed from 1972 until 1996 before an improved 688i version was designed.
The Los Angeles-class was scheduled to be phased out, in favor of the newer, fancier Seawolf-class submarines. But only three Seawolf subs were ever built (of the 29 originally planned), leaving the Los Angeles intact as the Navy’s primary fast attack submarine.