The dog tags of Lance Cpl. Mark D. Juarez, Trucks Platoon, Headquarters and Service Company, 1st Battalion, 3rd Marine Regiment, hang from an upturned M-16A4 service rifle during a memorial service at Forward Operating Base Geronimo Jan. 19. Juarez, a 23-year-old from San Antonio, was killed, Jan. 9, while conducting combat operations in Afghanistan's Helmand province.