The modern ENDF has a wide mix of equipment. Many of its major weapons systems stem from the Communist era and are of Soviet and Eastern bloc design. The United States was Ethiopia's major arms supplier from the end of the Second World War until 1977, when Ethiopia began receiving massive arms shipments from the Soviet Union. These shipments, including armored patrol boats, transport and jet fighter aircraft, helicopters, tanks, trucks, missiles, artillery, and small arms have incurred an unserviced Ethiopian debt to the former Soviet Union estimated at more than $3.5 billion.