Lt. Col. Mike Corrado, a country-rock musician serving with U.S. Marine Corps Forces, Pacific, at Camp H. M. Smith, Hawaii, tunes his guitar during a warm-up session at Six Flags America, Mitchellville, Md., July 24, 2010. Corrado learned to play the guitar as an alternative to the drums when he was living in the barracks at The Citadel, Charleston, S.C. - Lt. Col. Mike Corrado, a country-rock musician serving with U.S. Marine Corps Forces, Pacific, at Camp H. M. Smith, Hawaii, tunes his guitar during a warm-up session at Six Flags America, Mitchellville, Md., July 24, 2010. Corrado learned to play the guitar as an alternative to the drums when he was living in the barracks at The Citadel, Charleston, S.C.