Who is Captain Andrew Allison "Ack Ack" Haldane (AKA "Skipper") from With the Old Breed, at Peleliu and Okinawa and what is their importance?

Captain Andrew Allison was born August 22, 1917, in Lawrence, Massachusetts. He served with K/3/5 at Guadalcanal and was subsequently placed in charge of the company. He led the company with distinction at Cape Gloucester, receiving a Silver Star, and in the attack on Peleliu. He was killed on Peleliu on October 12, 1944, by a sniper, while reconnoitering his company's segment of the combat lines. Sledge describes him with praise, noting him to be personable and a genuine leader of men. Nearly all K/3/5 marines view Haldane with respect and consider him the very essence of a proper marine officer. His "Ack Ack" nickname is derived from his initials, A. A.; his "Skipper" nickname is routinely shared by many company commanding officers.