Answer: I would say Oorah: My life in the Marines.
Step-by-step explanation:
A Memoir is someone’s life experiences that they’ve written about
from a particular time.
“Oorah: Captain” doesn’t tell me anything about the book.
“Oorah: My Experience in Boot Camp” is a promising option however the into reason I wouldn’t choose this is because of how short a period it is (the Marines Boot Camp lasts approximately 12 weeks).
“Oorah: My life in the Marines” covers a career in the marines, and would be enough material for a book.
“Oorah: The History of the American Marines” wouldn’t be a memoir, as it’s talking about the history of a military branch.
Hope this helps!