Shootdown authority was first communicated to NEADS at 10:31.
( ( Shootdown authority ) ( ( ( was first ) ( communicated ( to ( NEADS ( at 10:31 ) ) ) ) ) . ) )
(ROOT (S (NP (NN Shootdown) (NN authority)) (VP (VBD was) (ADVP (RB first)) (VP (VBN communicated) (PP (TO to) (NP (NP (NNS NEADS)) (PP (IN at) (NP (CD 10:31))))))) (. .)))
At 10:31, NEADS received a communication.
( ( At 10:31 ) ( , ( NEADS ( ( received ( a communication ) ) . ) ) ) )
(ROOT (S (PP (IN At) (NP (CD 10:31))) (, ,) (NP (NNS NEADS)) (VP (VBD received) (NP (DT a) (NN communication))) (. .)))