The Argentine armed forces numbered 69,900 active personnel in 2002 with no formally established reserves. The army of 40,000 was organized into three corps and included armored, mechanized infantry, engineer and artillery battalions. The navy had 16,000 personnel including 2,500 marines. Equipment included 3 submarines, 8 frigates, and 14 coastal combatants. The Air Force numbered 12,500 with 130 combat aircraft and 29 armed helicopters. Defense spending for 1999 was $4.3 billion or1.3% of GDP. Argentina participated in UN peacekeeping missions in six regions.