US Marines
Based on the 1st Marine Division, but you can think of it as the whole marine corp!
Desert
Woodland
The 1st Marine Division is a Marine infantry division of the United States Marine Corps headquartered at Marine Corps Base Camp Pendleton, California. It is a subordinate unit of the I Marine Expeditionary Force (I MEF).
It is the oldest and largest active duty division in the United States Marine Corps, representing a combat-ready force of more than 19,000 men and women. It is one of three active duty divisions in the Marine Corps today and is a multi-role, expeditionary ground combat force.
About the helmet:
In 2018, the Marine Corps ordered nearly 200 Gentex Corp. ECH helmets with various cuts to test their compatibility with a range of new tactical headsets and hearing protection devices. Gentex is the maker of the iconic Ops-Core high-cut style helmet worn by special operations forces.
Marines are working on a high-cut version of the enhanced combat helmet, or ECH, which is already in use by troops with U.S. Special Operations Command. The higher cut allows for the use of networked communications and hearing protection devices.
There is no doubt that the equipment of the Marine Corps has developed faster.