Essay “things they carried by Tim o’brien, book”

Answer the following question in the essay : What is a significant theme developed by Tim O’Brien  in The Things They Carried? How did O’Brien used tone, mood and characterization to develop that theme? At least 5 paragraphs and 3 pages typed with proper MLA formatting and citations of all reference works ( all information cited, 10 quote, MLA format ) no plagiairsm