Night Optics Falcon 6x Gen 3 Gated Long-Range Night Vision Binocular - Manual (Page 95)

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(6) Hook the helmet mount bracket in the center of the front
lip of the helmet and hold it in place.
(7) With the buckle lever open, take up the slack in the strap
using the catch. Close the buckle lever.
(8) Disengage the nape strap latch on left side of nape
strap.
(9) Don the helmet. Do not fasten the helmet chinstrap.
(10) Engage the nape strap at the nape strap latch. Tension
the nape strap for a stable fit, then install and tension the helmet
chinstrap. The brow of the helmet should be parallel to the ground
and the helmet stable on the head.
(11) Insert the top edge of the mount under the keeper on the
helmet mount bracket and rotate downward until the latch
engages. (See Figure 2-24) To release the mount from the
helmet bracket, press the release button (see Figure 2-23) and pull
forward and down.