"Clear the Bridge" by O'Kane
"Thunder Below" by Eugen Fluckey
My favorite US sub books are fiction, but very realistic. Written by Edward L. Beach who served on subs during WWII. They are:
"Run Silent, Run Deep"
"Dust on the Sea"
"Cold is the Sea"
They are a "trilogy". The first two are set in WWII, the third is set during the cold war.
Check out Beach's "Submarine" as well. True stories about US boats as well as his own experiences during the war on subs.