Bring the Reinforcements

This quest lets you change between which Outpost buff you get while in Tanaan.

As an alliance player on the PTR my choices were:

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• [spell=161676]
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• [spell=162075]
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• [spell=164050]
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Choose your favorite one, and don't worry...most importantly..

You can freely change it any time after the quest simply by talking to him.

The Tanaan Jungle outpost ability list is a mix of your outpost preferences currently used in other zones:

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• [spell=161676] - Garrison ability
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• [spell=164050] or [spell=164012] - Gorgrond outpost ability
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• [spell=161767] or [spell=162075] - Talador outpost ability
• 
  

You can change what Tanaan outpost abilities are available by simply switching the outpost buildings in the corresponding zones listed above.

Note, while you can switch the Tanaan outpost ability free of charge, the cost of building switch in the mentioned zones is still 5000 gold.

Just posting a 6.2 update confirmation for non-PTR/live servers:

Unlike the other Draenor zones where this would be a choice that affects the zones quest chains and is expensive to change, this is simply choosing one of 3 previous zone buffs to use in Tanaan Jungle.

Call to Arms - originally from Shadowmoon Valley
Artillery Strike - originally from Talador
Summon Mechashredder 5000 - originally from Gorgrond

You can choose whichever you personally like most without being phased from party members who choose something else.

Also, to change to a different ability, simply speak with Angar Steelbellow in Lion's Watch to switch abilities for free.