I've just done a quick look and it's technically both apparently, the singleplayer segment takes place around 2012/2013 however the multiplayer segment itself takes place two years after, the whole Global Attacks. Seeing from what I can gather the singleplayer mentions it being 2012 - 2013 and the respective information is already on 3A7's page I don't see too much point in changing the date on the Mercenaries page as it's characters completely unrelated to the character from the game's singleplayer 'The Experiment'.
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If you need any further help, contact the signing admin on my talk page and I'll see if I can help you with anything else! Riley Heligo (talk) 01:37, August 16, 2016 (UTC)