It is not clear how the shootdown order was communicated within NORAD.
( It ( ( ( ( is not ) clear ) ( how ( ( the ( shootdown order ) ) ( was ( communicated ( within NORAD ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBZ is) (RB not) (ADJP (JJ clear)) (SBAR (WHADVP (WRB how)) (S (NP (DT the) (NN shootdown) (NN order)) (VP (VBD was) (VP (VBN communicated) (PP (IN within) (NP (NNP NORAD)))))))) (. .)))
It is crystal clear how the shootdown order was communicated within NORAD. 
( It ( ( ( is ( crystal clear ) ) ( how ( ( the ( shootdown order ) ) ( was ( communicated ( within NORAD ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBZ is) (ADJP (RB crystal) (JJ clear)) (SBAR (WHADVP (WRB how)) (S (NP (DT the) (NN shootdown) (NN order)) (VP (VBD was) (VP (VBN communicated) (PP (IN within) (NP (NNP NORAD)))))))) (. .)))