S.L.A. Marshall (full name, Samuel Lyman Atwood Marshall) served in World War I and then embarked in a career in journalism. In World War II, he was chief combat historian in the Central Pacific (1943) and chief historian for the European Theater of Operations (1945). He authored some 30 books about warfare, including Pork Chop Hill: The American Fighting Man in Action, The River and the Gauntlet and Men Against Fire: The Problem of Battle Command in Future War.
I am sure this was written on hastily handwritten notebooks during the intensity of fighting. S. L. A. Marshall was a old timer from past wars.He gave his best support to the troops, but he lacked verified information when he transcribed those killed or wounded. He made mistakes so if your loved one is mentioned, I hope, for your sake, that he described the right man in the right place at the right time.