Eugene Bondurant Sledge was a United States Marine, university professor, and author. His 1981 memoir With the Old Breed: At Peleliu and Okinawa chronicled his combat experiences during World War II and was used as source material for the Ken Burns PBS documentary The War (2007), as well as the HBO miniseries The Pacific (2010), in which he is portrayed by Joseph Mazzello.

With the Old Breed: At Peleliu and Okinawa is a World War II memoir by United States Marine Eugene Sledge, first published in 1981. The memoir is based on notes Sledge kept tucked away in a pocket-sized Bible he carried with him during battles he fought at Peleliu and Okinawa. The book formed part of the basis of the material covered by Ken Burns' PBS documentary The War (2007), as well as the HBO miniseries The Pacific (2010), in which Sledge was portrayed by Joseph Mazzello.