WEBVTT

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Marine

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jews metal detectors to sweep a culvert

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during a route reconnaissance mission ,

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ensuring the area's clear of improvised

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explosive devices . The purpose of the

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mission is to document different

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aspects of the route , such as incline

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and decline , sharpness of the curves ,

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and with the data , is used to

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calculate where improvements need to be

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made in order to prevent washout along

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the route .