sentences:  January through April saw "Piedmont" in his most sustained effort.Those same months which witnessed the seaborne invasions of Lingayen, Iwo Jima, and Okinawa, found the repair department averaging more than 1,000 completed job orders and almost 100,000-man hours of work each month.During the long, bitter weeks of the Iwo-Okinawa operations, the United States fleet suffered more damage than at any other time in its history.