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Replacement SPH-4B, SPH-5, HGU-56 Flight Helmet Chin Strap with Fidlock Quick Release Buckle, designed to snap onto the helmet's D ring on one end of the strap and lace through the helmet's double D-rings on the other end of the strap, new condition.
SPH-4B
Tactical ANVIS Night Vision Goggle Mount Adapter Plate For GSGM DPAM NVG Mount CNC HGU-56/P SPH-4 Flight Helicopter Helmet Black - AliExpress
Gentex SPH-5 Helicopter Helmet System – Helicopter Helmets
, designed to snap onto the helmet's D ring on one end of the strap and lace through the helmet's double D-rings on the other end of the strap,
Replacement SPH-4B, SPH-5, HGU-56 Flight Helmet Chin Strap with Fidlock Quick Release Buckle
DOI/USFA Aviation Helmet Standards for flight helmet safety
SPH-4B
SPH-4 HELLYCOPTER PILOT HELMET US CAVALRY / PILOT BAG
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Tactical GSGM Ground Spec Goggle Mount w/ HGU-56/P SPH-4 Flight Helmet Adapter For AN/AVS-6 AVS-9 ANVIS GPNVG-18 Night Vision BK
Gentex SPH-5 Dual Visor Helicopter Flight Helmet Regular R with Flight Bag