Gustavo Moncayo (C), father of Colombian soldier Pablo Emilio Moncayo, walks with supporters in Jamundi, Valle province, in this picture taken on June 29, 2007. Moncayo has become a hero to thousands of families of kidnap victims since he started his hike across Colombia in June, calling for a swap of rebel hostages for guerrillas held in government jails. His son, Pablo Emilio, was captured when guerrillas from the Revolutionary Armed Forces of Colombia, or FARC, attacked an army post in 1997, shortly before his 19th birthday. Moncayo has heard nothing of him for more than four years. Picture taken June 29, 2007. REUTERS/Carlos Duran (COLOMBIA)