SgtMaj David Devaney, USMC Sniper, Iraq

David Devaney enlisted in the U.S. Marine Corps in 1983. After surviving boot camp, he soon pursued the opportunity to become a U.S. Marine sniper and was part of the early invasion of Iraq in March 2003.In this edition of "Veterans Chronicles," SgtMaj Devaney shares his memories at Parris Island both in training and as a drill sergeant. He also talks about what it takes to become a sniper, dealing with Iraqi forces and sandstorms in the early days of the Iraq War, and the mindset necessary to be effective in combat.