Read Beach's continuation of "Run SIlent, Run Deep" called "Dust on the Sea". Continues where RSRD left off. He also wrote "Cold is the Sea" which is the third book in the "trilogy" which takes place during the cold war with the same characters. Of course, read his "Submarine" which is full of true stories of US Fleet Boats in WWII, including his personal experiences.
When you finish "Operation Drumbeat", try Gannon"s "Black May". Very good as well. was a real eye opener at times.