Night Optics Falcon 6x Gen 3 Gated Long-Range Night Vision Binocular - Manual (Page 101)

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Section IV. Operating Procedures
This section contains operating procedures for using the NVG as
hand-held, head mounted or helmet mounted goggles. Prior to
operating the goggles, make certain that all steps in Section III,
Assembly and Preparation for Use, have been read and
performed.
2-21 HEAD MOUNTED OPERATION
Operate the goggles only under darkened
conditions or use the objective lens cap to cover
the objective lens for daylight conditions.
(1) Ensure that batteries are installed per paragraph 2-6.
(2) Don the headmount per instructions in paragraph 2-13.
NOTE
Paragraphs 2-14 and 2-15 provide additional
information required when installing the
headmount with a protective mask, or helmet.
CAUTION