According to the description of the Stalker Helmet, the UNSC/ ONI have used the stealth brutes’ armour and equipment to help further the Stalker helmet. As seen here. “Developed by the NCC via intel previously gleaned from Jiralhanae stealth kits”
Nothing too big but thought some people might find it interesting!
Also, a link to a thread I made last night about some more cool stuff found in helmet descriptions, specifically about the Halo Arrays 
Enjoy!