Tripwire feeler
Image 8. Increase the height of the tripwire feeler as high as the operational threat assessment dictates
3.3.3.BUILDINGS AND STRUCTURES Tripwires can be used very effectively by armed groups inside buildings, where constrictions in passageways offer good emplacement opportunities and lower levels of natural light hamper visual detection.
Tripwire feeler
Image 9. Using a tripwire feeler in a passageway where there is less natural light
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