High-tenacity fibers in Call of Duty: Modern Warfare 4's DMZ mode are one of the most sought-after crafting materials, especially when you're still learning the ropes of the game, because they're used for a number of upgrades around your FOB. The most important of these is the uncommon ingredient printing upgrade, as that allows you to manufacture higher-rarity crafting materials. So if you're in dire need of more high-tenacity fibers in DMZ in Modern Warfare 4, here are the best places to loot.
The best place to get high-tenacity fibers, in my experience, is the Songdo Wharf La Grand Vie rooftop. This is one of three locations listed in-game under the ingredient locations, but where the Chang-san Air Base armory and barracks are densely populated with enemies, the La Grand Vie rooftop in Songdo Wharf has considerably fewer. Make sure you're checking both the 13th floor and the rooftop itself, as high-tenacity fibers can frequently spawn on both.
In my experience, high-tenacity fibers also typically spawn as floor loot, so make sure you're checking everywhere, not just inside containers. La Grand Vie will often have a commander patrolling nearby, or even two, as I've been under threat from Colossus and either a Death Stalker or a Tank before, but as long as you stay as stealthy as possible, you should be able to evade them. I'd recommend going in with a silenced weapon, so you don't raise the alarm.
While you're there, you're only a stone's throw from the Netshin Tech Complex, and this is also where you will need to place a transmitter for one of the chapters, so you can kill two birds with one stone.
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