Night Optics Falcon 6x Gen 3 Gated Long-Range Night Vision Binocular - Manual (Page 87)

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(10) Engage the nape strap at the nape strap latch. Tension
the chinstrap and nape strap for a secure and stable fit. The brow
of the helmet should be parallel with the ground.
2-17 INSTALLATION OF NEW HELMET MOUNT TO
HELMET
(1) Remove the helmet mount (Figure 1-3) from the carrying
case. Make sure the helmet mount is complete. Refer to Figure 2-
18 for the helmet mount components and features.
Figure 2-18. Helmet Mount Components and Features.