What type of details about james a. winnefeld , jr. .  can be gathered from the following bio?  Bio: james alexander `` sandy '' winnefeld , jr. -lrb- born april 24 , 1956 -rrb- was a united states navy admiral who served as the ninth vice chairman of the joint chiefs of staff from august 4 , 2011 to july 31 , 2015 . he previously served as the fourth commander , u.s. northern command -lrb- usnorthcom -rrb- and the 21st commander , north american aerospace defense command -lrb- norad -rrb- from may 19 , 2010 to august 3 , 2011 . prior to that , winnefeld served as director for strategic plans and policy , the joint staff which he concurrently served as the senior member , u.s. delegation to the u.n. military staff committee . his other operational commands include serving as the commander , u.s. sixth fleet and commander , allied joint command lisbon . as the vice chairman of the joint chiefs of staff , winnefeld was the second highest-ranking officer in the united states armed forces , second only to the chairman of the joint chiefs of staff . he retired from the navy after over 37 years of service .
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