Explain the combat contract and apply it to World War I or World War II, and Korea or Vietnam

Explain the combat contract and apply it to World War I or World War II, and Korea or Vietnam
NO OUTSIDE SOURCES!! so do not come up with random dates and stats if its not stated by the book. the paper is very straightforward, please write a 7 pages paper (cover page and pictures do not count) explaining the combat contract and apply it to WWI or WWII with Korea or Vietnam wars using sources ONLY from Kindsvatter, Peter S. American Soldiers: ground combat in the World Wars, Korea, and Vietnam. Please only write this paper if you have read or will read the book. The book Kindsvatter, P. S. (2003). American soldiers: Ground combat in the World Wars, Korea, and Vietnam. Lawrence, Kan: Univ. Press of Kansas