SITIO EL NINO, EL SALVADOR - DECEMBER 8:  Soldiers of the Atlacatl Batallion sing the national anthem during a demobilizing ceremony 08 December in this town 30 kilometers (18 miles) west of the capital. Soldiers of the Atlacatl Batallion were trained in the U.S. to combat Salvadoran guerrillas.    AFP PHOTO  (Photo credit should read AFP/AFP via Getty Images)