As of 2002, Tunisia had an army of 27,000 personnel equipped with 84 main battle tanks and 54 light tanks. The navy numbered 4,500 operating 21 patrol boats and other craft. The air force had 3,500 personnel, 29 combat aircraft and 15 armed helicopters. Paramilitary consisted of a 12,000-member national guard. Tunisia participated in peacekeeping efforts in the DROC and Ethiopia/Eritrea. Defense expenditures in 1999 were $356 million or 1.5% of GDP.