Commonly seen with US SOF last decade and nowadays; the Ops Core FAST
1.0 US Combat Helmet Evolution
About how the Ops Core FAST was developed, and its place in the Combat Helmet Evolution is a lot to tell about, and I thought it would be interesting to share.
For the general overview I poured that into the diagram below
1.1 PASGT Personnel Armor System for Ground Troops
In the mid-seventies the US DoD infantry equipment, was mostly outdated and still from WWII, Korea, and Vietnam!