CAMP BLUE DIAMOND, AR RAMADI, Iraq -- Lance Cpl. Carlos Garza, a 20-year-old Houston, Texas native and administration clerk with Headquarters Battalion, uses a piece of cryptological equipment while learning how to use the Personnel Radio Component 119 (PRK-119) system, March 24. The VHF radio is the Corps' main mode of communication in ground combat operations for Operation Iraqi Freedom. U.S. Marine Corps photo by Sgt. Stephen D'Alessio (RELEASED)