Lewin had served four years as an officer in the Israeli military.
( Lewin ( ( had ( ( served ( four years ) ) ( as ( ( an officer ) ( in ( the ( Israeli military ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Lewin)) (VP (VBD had) (VP (VBN served) (NP (CD four) (NNS years)) (PP (IN as) (NP (NP (DT an) (NN officer)) (PP (IN in) (NP (DT the) (JJ Israeli) (NN military))))))) (. .)))
Lewin had never served in a military.
( Lewin ( ( ( had never ) ( served ( in ( a military ) ) ) ) . ) )
(ROOT (S (NP (NNP Lewin)) (VP (VBD had) (ADVP (RB never)) (VP (VBN served) (PP (IN in) (NP (DT a) (NN military))))) (. .)))