Active armed forces numbered approximately 74,500 in 2002, supported by some 400,000 reservists. The army of 60,000 was equipped with more than 1,000 main battle tanks and 557 armored infantry fighting vehicles. There was a navy with 3,500 personnel, including 900 marines. The navy manned four submarines, three frigates, 31 patrol and coastal combatants, and 10 other craft. The air force of 11,000 had 103 combat aircraft and 44 armed helicopters. The paramilitary consisted of around 40,000 members of an internal security force. There were 34,500 international peacekeeping troops from 30 countries stationed in Yugoslavia as part of the Kosovo Peace Implementation Force. Defense expenditures amounted to $654 million in 2002.