My surreptitiously retained file of war-patrol reports of Trigger , Tirante , and Piper (submarine numbers 237, 420, and 409) still makes fascinating reading, to me at least. Trigger (SS 237), completed at Mare Island, California, early in 1942, started her career slowly, but as we learned our dreadful business her improvement was steady. Before she died, a tired old submarine at age three years, she had been, for a time, the highest-ranking sub in the Pacific Fleet in terms of overall damage to the enemy.