View image in fullscreen Members of the ELN’s Western War Front take part in military exercises in southern Chocó, Colombia. Photograph: Santiago Mesa/The GuardianView image in fullscreen A member of the ELN’s Western War Front rests inside a shelter in southern Chocó. Photograph: Santiago Mesa/The GuardianView image in fullscreen An ELN member poses for a photograph at a camp in southern Chocó. Photograph: Santiago Mesa/The GuardianColombia’s conflict began in the 1960s, rooted in extreme land inequality and exclusionary politics. Photograph: Santiago Mesa/The GuardianView image in fullscreen ELN members in thick vegetation near a camp in southern Chocó.