What type of details about robert j. dixon  can be gathered from the following bio?  Bio: robert james dixon -lrb- april 9 , 1920 -- march 21 , 2003 -rrb- was a united states air force four-star general who served as commander , tactical air command -lrb- comtac -rrb- from 1973 to 1978 . he also served simultaneously as commander in chief of u.s. air forces for both the atlantic and u.s. readiness commands .
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