U.S. Reserve components compete in the Interallied Confederation of Reserve Officers (CIOR) Military Competition, an annual reserve military competition consisting of NATO member states and other participating nations with 34 countries in total,representing 1.3 million reservists. The MILCOMP, which has been held since 1957, is a military pentathlon testing service members in pistol and rifle marksmanship, land and water obstacles and orienteering.