The government of Iran has a paramilitary, volunteer militia force within the Islamic Revolutionary Guard Corps, called the ''Basij'', which includes about 90,000 full-time, active-duty uniformed members. Up to 11 million men and women are members of the Basij who could potentially be called up for service. GlobalSecurity.org estimates Iran could mobilize "up to one million men", which would be among the largest troop mobilizations in the world. In 2007, Iran's military spending represented 2.6% of the GDP or $102 per capita, the lowest figure of the Persian Gulf nations. Iran's military doctrine is based on deterrence. In 2014, the country spent $15 billion on arms, while the states of the Gulf Cooperation Council spent eight times more.