Armed forces in 2002 had an estimated total of 3,100 personnel. The army of 2,500 consisted of two infantry battalions and one engineering battalion. Maritime forces (400) were equipped with four patrol and coastal craft and two amphibious craft. The air force (200) had no armed aircraft. Australia provides a 38-member training unit. Defense expenditures totaled $42 million in 1998 or 1% of GDP. The Bougainville peace monitoring group includes some 55 troops from Australia, New Zealand, and Fiji.