Valles Caldera Valles Caldera dates back to the prehistoric times: spear points dating to 11,000 years ago have been discovered. Several Native American tribes frequented the caldera, often seasonally for hunting and for obsidian, used for spear and arrow points. Obsidian from the caldera was traded by tribes across much of the Southwest. Eventually, Spanish and later Mexican settlers as well as the Navajo and other tribes came to the caldera seasonally for grazing with periodic clashes and raids. Later as the United States acquired New Mexico as part of the Treaty of Guadalupe Hidalgo in 1848, the caldera became the backdrop
Association of Chief Police Officers in Scotland Association of Chief Police Officers in Scotland The Association of Chief Police Officers in Scotland (ACPOS) was the professional voice of police leadership (Chief Constables, Deputy Chief Constables and Assistant Chief Constables) in Scotland, including the Assistant Chief Constable in the British Transport Police responsible for Scotland. Some superintendents and senior support staff were also involved in its business. Along with all eight Scottish regional police forces and the Scottish Crime and Drug Enforcement Agency, ACPOS was merged into Police Scotland and ceased to operate on 1 April 2013. Formerly a staff association, in 2006 it was incorporated as a