this mod is just a small sample of whats to come in a very ambitiously creative and unrelated project called "SkullHound Agency Bunker DLC" 
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This mod is fully voiced and there are 9 missions focusing on the SKULLHOUND terrorist storyline from start to end. 
New gunrunning DLC music will play though out the missions 
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Change Log 3.2.1 
you will need to download NativeUI, link below 
improved audio codes 
SectorXAudio folder now needs to be placed in gta 5 scripts folder so people with any hard drive letter can use the mod properly. 
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Info: 
Join a government agency known as sector x and complete top secret missions for them. 
Go To the X icon just outside the army base, Stand in the yellow marker and press J to start the mod. 

SKULLHOUND Storyline 9 missions: 

-Training Mission 1: INTRO A Training Program That Simulates a Terrorist invasion at the army base. 

-Mission 2: A sector x agent gives you, your first mission to kill all invading terrorists and their leader in the countryside area. 

-Mission 3: infiltrate a terrorist base located just off the coast and eliminate all terrorists and secure the base. 

-Mission 4: Objective is to get intel on the epsilon to prove they are helping terrorists, but something goes wrong. 

-Mission 5: Escape from The Terrorists Prison and base. 

-Mission 6: Eliminate the terrorist threat in the city of los santos. 

-Mission 7: Terrorists are planning to release toxic chemicals over the city, you must stop them and secure the chemical weapon. 

-Mission 8: Terrorists Invades Fort Zancudo And SX49 Must Stop Them In A Big Rhino Tank Battle 

-Mission 9: sector x gets intel of a terrorist base and you are sent there to kill the terrorist leader to end SKULLHOUND for good! 

Install: 
Put the folder "SectorXAudio" in GTA V "scripts" folder 
Put SectorXMissions.dll file in GTA V "scripts" folder 
Put SectorXProps.dll file in GTA V "scripts" folder 
Put NATIVEUI.DLL file in GTA V "scripts" folder 

Requires: 
ScriptHook V 
ScriptHook V Dot Net 2 
NATIVEUI.DLL 
Windows Media Player 

NativeUI Link: 
http://gtaforums.com/topic/809284-net-nativeui/ 

Mod By ShadowCoderKing/SpiderMight