Night Optics Falcon 6x Gen 3 Gated Long-Range Night Vision Binocular - Manual (Page 84)

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(2) Ensure that the strap is adjusted so that the “M” marking
is aligned with the top of the helmet mount block (See Figure 2-
15.)
Figure 2-15. Helmet Strap Size Adjustment.
(3) With catch in forward most position, place the strap over
the top of the helmet, center and hook the rear bracket onto the
rear of the helmet. Center the front bracket, hook it on the front of
the helmet and hold it in place. (See Figure 2-14.)
(4) With the buckle lever open, take up the slack in the strap
using catch. Close the buckle lever. (See Figure 2-16.)
(5) Place helmet upside down with helmet mount facing you.