| 21. | On 15 February the new Semi Automatic Ground Environment ( SAGE ) Direction Center ( DC-16 ) became operational.
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| 22. | Most models have 6-speed manual transmissions; whilst a smaller number of other models use the semi automatic Selespeed system.
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| 23. | On 15 November 1959, the new Semi Automatic Ground Environment ( SAGE ) Direction Center ( DC-10 ) became operational.
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| 24. | On 1 March 1959 the new Semi Automatic Ground Environment ( SAGE ) Direction Center ( DC-05 ) became operational.
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| 25. | On 1 February 1959 the new Semi Automatic Ground Environment ( SAGE ) Direction Center ( DC-04 ) became operational.
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| 26. | On 1 December 1961, the new Semi Automatic Ground Environment ( SAGE ) Direction Center ( DC-22 ) became operational.
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| 27. | On 15 November 1959, the new Semi Automatic Ground Environment ( SAGE ) Direction Center ( DC-11 ) became operational.
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| 28. | This version of the aircraft was extensively used within the Semi Automatic Ground Environment ( SAGE ) air defense system.
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| 29. | On 1 December 1960 the new Semi Automatic Ground Environment ( SAGE ) Direction Center ( DC-18 ) became operational.
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| 30. | On 15 February 1960 the new Semi Automatic Ground Environment ( SAGE ) Direction Center ( DC-20 ) became operational.
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