At 9:39, the NMCC's deputy director for operations, a military officer, opened the call from the Pentagon, which had just been hit.
( ( At 9:39 ) ( , ( ( ( ( the ( NMCC 's ) ) ( deputy director ) ) ( for ( ( ( operations , ) ( a ( military officer ) ) ) , ) ) ) ( ( ( opened ( the call ) ) ( from ( ( ( the Pentagon ) , ) ( which ( ( had just ) ( been hit ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN At) (NP (CD 9:39))) (, ,) (NP (NP (NP (DT the) (NN NMCC) (POS 's)) (JJ deputy) (NN director)) (PP (IN for) (NP (NP (NNS operations)) (, ,) (NP (DT a) (JJ military) (NN officer)) (, ,)))) (VP (VBD opened) (NP (DT the) (NN call)) (PP (IN from) (NP (NP (DT the) (NNP Pentagon)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBD had) (ADVP (RB just)) (VP (VBN been) (VP (VBN hit))))))))) (. .)))
The Pentagon was hit while on the call.
( ( The Pentagon ) ( ( was ( ( hit while ) ( on ( the call ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNP Pentagon)) (VP (VBD was) (VP (VBN hit) (NP (NN while)) (PP (IN on) (NP (DT the) (NN call))))) (. .)))