GI Helmet

choi

Infantry: Helmet Tech. Strategy Page, July 1, 2015.
strategypage.com/htmw/htinf/articles/20150701.aspx

Note:
(a) "the American ACH (Advanced Combat Helmet), as popular as it was after appearing in the 1990s, soon underwent tweaks to make it more stable."

Advanced Combat Helmet
https://en.wikipedia.org/wiki/Advanced_Combat_Helmet
(photo legend: The helmet is equipped with a Universal Camouflage Pattern helmet cover with a night vision device mounting bracket on the front)

There are two types of flip-own eyepieces: infrared and computer.
(b) Read only 1 1 /2 paragraphs.