At 9:21, NEADS received a report from the   Military, Boston Center.
( ( At 9:21 ) ( , ( NEADS ( ( ( received ( a report ) ) ( from ( ( ( the Military ) , ) ( Boston Center ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN At) (NP (CD 9:21))) (, ,) (NP (NNS NEADS)) (VP (VBD received) (NP (DT a) (NN report)) (PP (IN from) (NP (NP (DT the) (NNP Military)) (, ,) (NP (NNP Boston) (NNP Center))))) (. .)))
The NEADS got the report at 9:21 from Boston center.
( ( The NEADS ) ( ( ( ( got ( the report ) ) ( at 9:21 ) ) ( from ( Boston center ) ) ) . ) )
(ROOT (S (NP (DT The) (NNS NEADS)) (VP (VBD got) (NP (DT the) (NN report)) (PP (IN at) (NP (CD 9:21))) (PP (IN from) (NP (NNP Boston) (NN center)))) (. .)))