( ( Invisible ( to ( the ( unaided eye ) ) ) ) ( , ( ( the ( infrared lights ) ) ( ( ( identify ( a ( precise ( landing site ) ) ) ) ( for ( pilots ( ( wearing ( special ( night-vision goggles ) ) ) ( without ( alerting ( hostile forces ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (S (ADJP (JJ Invisible) (PP (TO to) (NP (DT the) (JJ unaided) (NN eye))))) (, ,) (NP (DT the) (JJ infrared) (NNS lights)) (VP (VBP identify) (NP (DT a) (JJ precise) (NN landing) (NN site)) (PP (IN for) (NP (NP (NNS pilots)) (VP (VBG wearing) (NP (JJ special) (JJ night-vision) (NNS goggles)) (PP (IN without) (S (VP (VBG alerting) (NP (JJ hostile) (NNS forces))))))))) (. .)))
Invisible to the unaided eye, the infrared lights identify a precise landing site for pilots wearing special night-vision goggles without alerting hostile forces.
(ROOT (S (NP (PRP You)) (VP (MD can) (VP (VB use) (NP (NN night) (NNS goggles)) (S (VP (TO to) (VP (VB see) (NP (JJ infrared) (NN light))))))) (. .)))