Army Air Forces Statistical Digest,
World War II
Table 156 -- Rounds of Ammunition Expended by Twentieth Air Force, By Type of Airplane and by Type of Ammunition: 1944 and1945

(In thousands of rounds)

Type of Airplane and Type of Ammunition Grand Total 1944
(Jun-Dec)		 1945
(Jan-Aug)
Total      
Machine Gun: 50 caliber 11,368 2,036 9,332
Cannon: 20 millimeter 32 25 7
       
Very Heavy Bomber      
XX Bomber Command      
Machine Gun: 50 caliber 1,392 1,155 237
Cannon: 20 millimeter 13 13 -
XXI Bomber Command      
Machine Gun: 50 caliber 7,561 881 6,680
Cannon: 20 millimeter 17 12 5
Fighter      
Machine Gun: 50 caliber 2,415 - 2,415
Cannon: 20 millimeter 2 - 2