Mitsubishi G4M

The Mitsubishi G4M (or "Type 1 land-based attack aircraft") (一式陸上攻撃機, 一式陸攻 Isshiki rikujō kōgeki ki, Isshikirikkō) was the main twin-engine, land-based bomber used by the Imperial Japanese Navy Air Service in World War II. The Allies gave the G4M the reporting name Betty. The Allies usually gave Japanese fighters and floatplanes male names, while giving female names to bombers and reconnaissance aircraft. These code names did not come into general use until mid-1943. Japanese Navy pilots called it "葉巻" Hamaki (Cigar), due to its cylindrical shape.

The G4M had a one-way range of about 3,700 miles (6,000 km) which was achieved by its structural lightness and an almost total lack of protection for its crew, with no armor plating or self-sealing aviation fuel tanks. These omissions proved to be its weakness when opposition from American fighter aircraft increased during the second half of the Pacific War of World War II.