ACH-GEN-II — The Military Helmet Spec LE Actually Cares About
The US Army's Advanced Combat Helmet Generation II performance spec, and why LE procurement increasingly writes it into helmet RFPs alongside NIJ 0106.
ACH-GEN-II — The Military Helmet Spec LE Actually Cares About
ACH-GEN-II — Advanced Combat Helmet Generation II — is the US Army's performance specification for the successor to PASGT. While it's fundamentally a military spec, its threat envelope (fragmentation + handgun) and rigorous test methodology make it the de-facto upgrade target for US LE helmet procurement.
What ACH-GEN-II specifies
The spec is performance-based, not geometric — it doesn't prescribe a particular cut, weight, or shell material. What it requires:
- Fragmentation V50 — 17-grain FSP (fragment simulating projectile) at ≥2,100 fps
- 9mm V50 — 124-gr 9mm FMJ at ≥2,000 fps
- Backface deformation — limited skull displacement at threat impact
- Retention — retention system must remain secured through ballistic + impact testing
- Impact attenuation — blunt-force performance to specified G-force limits
The V50 methodology uses MIL-STD 662F as the governing test protocol.
Why LE cares
NIJ 0106 tops out at Level II — 9mm at 1,175 fps against the shell. That's a narrower envelope than the modern LE threat model:
- Active-shooter incidents increasingly involve rifle threats, for which helmet ballistic rating is a non-starter (rifle threats exceed helmet-practical defeat capabilities at most reasonable weights — for rifle head protection, most SOCOM and LE programs rely on behind-cover + mobility, not shell ballistic rating)
- Fragmentation — from rifle-shot glass, door-hinge shrapnel, explosive devices — is a real LE threat that NIJ 0106 doesn't address but ACH-GEN-II does
The practical RFP language:
"Helmet shall be NIJ 0106 Level II certified. In addition, helmet shall meet the ballistic performance criteria of ACH-GEN-II, including 17-gr FSP V50 ≥ 2,100 fps and 9mm FMJ V50 ≥ 2,000 fps."
This pair — NIJ 0106 for civilian-procurement compliance, ACH-GEN-II for actual threat performance — has become the de-facto LE helmet spec pattern.
ACH-GEN-II vs NIJ 0106 — a head-to-head
| Attribute | NIJ 0106 Level II | ACH-GEN-II |
|---|---|---|
| Handgun threat | 9mm @ 1,175 fps | 9mm @ 2,000 fps V50 (much higher) |
| Fragmentation | Not tested | 17-gr FSP @ 2,100 fps V50 |
| Backface | Tested (in clay) | Tested (to G-force limits) |
| Retention | Tested | Tested |
| Environmental conditioning | Limited | Fuller envelope |
| Civilian-procurement signal | Yes | Partial (federal / mil-adjacent agencies) |
ACH-GEN-II is significantly more rigorous on handgun V50 and adds fragmentation — the two threat classes LE actually encounters.
Manufacturers
Helmets certified to ACH-GEN-II (or its government-program successors) include Team Wendy EXFIL, Gentex Ops-Core FAST SF (and SAS), 3M Ceradyne ACH variants, Revision (Galvion) Batlskin, Hard Head Veterans ATE, and Avon Protection F90.
Every one of these is ALSO available in an NIJ 0106 Level II-certified SKU for LE procurement.
Specifying in procurement
For agencies moving away from legacy PASGT-lineage helmets, the RFP pattern is:
- Require NIJ 0106 Level II for civilian-procurement compliance
- Require ACH-GEN-II for threat performance
- Specify cut style (ACH, high-cut / FAST, etc.) per mission
- Specify NVG shroud compatibility (Wilcox L4 or Ops-Core VAS)
- Specify rail system (ARC, Wilcox, integrated)
See LE procurement helmet bids for full RFP language patterns.