What do the acronyms for tier 2 and tier 3 heavy weapon armors stand for?

What do the acronyms for tier 2 and tier 3 heavy weapon armors stand for? - Gray Scale Photography of Knight

The tier 2 and tier 3 heavy weapon armor names are acronyms (they have periods between each letter):

E.X.O. suit
W.A.R. suit

What do these acronyms stand for? I haven't found anything in-game that says anything about it.

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