Mackenzie's autobiography project is about American Sniper by Chris Kyle. The book details Kyle's experiences as a Navy SEAL sniper during the Iraq War. One notable event discussed is when Kyle shot and killed an insurgent from over 1,800 feet away, which contributed to him becoming the most lethal sniper in U.S. history. Mackenzie learned from Kyle's experiences that serving in the military can be both scary and dangerous, but is worthwhile if one truly wants to serve their country.