Polish armed forces numbered 163,000 in 2002, with reservists numbering 234,000. Army personnel numbered 104,050 equipped with over 1,000 main battle tanks. Navy personnel totaled 14,300 including 2,000 naval aviators. Equipment included four submarines, one destroyer, three frigates and 23 smaller combatants. The naval aviation wing was supplied with 26 combat aircraft and 12 armed helicopters. The air force had 36,450 personnel and 201 combat aircraft. Paramilitary consisted of 14,1000 border guards and 7,300 police. Poland provided troops and observers to 11 different UN peacekeeping missions. Defense expenditures for 2002 amounted to $3.5 billion, or 1.7% of GDP.