By Javier Verdin and Diego Oré ACAPULCO, Mexico (Reuters) – A volunteer police force in rural Mexico that says it has been overwhelmed by local kidnappings has recruited schoolchildren as young as 12 to join its ranks, the latest sign of how some parts of the country are struggling to cope with organized crime. Armed with rifles and sticks, and with their faces covered, boys and girls paraded around the local sports field this week before joining a patrol in Ayahualtempa, a mountain village in the southwestern state of Guerrero. “We can’t study because of lawlessness,” one recruited teenager t…