[PAR] [TLE] Northrop P-61 Black Widow [SEP] The Northrop P-61 Black Widow, named for the American spider, was the first operational U.S. warplane designed as a night fighter, and the first aircraft designed to use radar.  The P-61 had a crew of three: pilot, gunner, and radar operator.  It was armed with four 20 mm (.79 in) Hispano M2 forward-firing cannons mounted in the lower fuselage, and four .50 in (12.7 mm) M2 Browning machine guns mounted in a remote-controlled dorsal gun turret. [PAR] [TLE] Northrop F-15 Reporter [SEP] The Northrop F-15 Reporter (later RF-61) was an American unarmed photographic reconnaissance aircraft.  Based on the Northrop P-61 Black Widow night fighter, it was the last piston-powered photo-reconnaissance aircraft designed and produced for the United States Air Force.  Though produced in limited quantities, and with a relatively short service life, the F-15's aerial photographs of the Korean Peninsula would prove vital in 1950, when North Korea invaded the south.
[PAR] [TLE] Northrop P-61 Black Widow [ SEP ] The Northrop P-61 Black Widow , named for the American spider , was the first operational U.S. warplane designed as a night fighter , and the first aircraft designed to use radar . The P-61 had a crew of three : pilot , gunner , and radar operator . It was armed with four 20 mm ( .79 in ) Hispano M2 forward - firing cannons mounted in the lower fuselage , and four .50 in ( 12.7 mm ) M2 Browning machine guns mounted in a remote - controlled dorsal gun turret . [PAR] [TLE] Northrop F-15 Reporter [ SEP ] The Northrop F-15 Reporter ( later RF-61 ) was an American unarmed photographic reconnaissance aircraft . Based on the Northrop P-61 Black Widow night fighter , it was the last piston - powered photo - reconnaissance aircraft designed and produced for the United States Air Force . Though produced in limited quantities , and with a relatively short service life , the F-15 's aerial photographs of the Korean Peninsula would prove vital in 1950 , when North Korea invaded the south .
The Northrop F-15 Reporter was based on a night fighter that included how many mounted M2 Browning machine guns?
The Northrop F-15 Reporter was based on a night fighter that included how many mounted M2 Browning machine guns ?
four
four