U.S. Air Force Master Sgt. Rusty Chase, noncommissioned officer in charge of the 18th Component Maintenance Squadron precision measurement equipment laboratory production control, climbs through a cave as part of a tour of Iwo To, Japan, formerly known as Iwo Jima, July 26, 2012. The 18th Wing History Office gave airmen from the 18th Maintenance Group a tour of the battle site in an effort to further their military education. The tour was the second tour for 18th Wing airmen conducted by the 18th History Office.