Although a lot of people were shocked and complained about Arma 3's 'futuristic' setting, most of its equipment is actually in use already, or at the very least in prototype form.Was he truly offering answers or he was just hoping that Kerry never make it back to NATO, keeping the secret of his involvement in the whole affair? Night falls and he calls to say he won't return. In his ending, he taunts Kerry by promising him answers if he waits for him to return, while warning him of the incoming counter-attack.
Alternative Character Interpretation: Was Miller really intending to help the Aegis Taskforce survivors or was he just using them to further his own goals, sending them in increasingly dangerous missions, while he recovered information about the whereabouts of the device? It should be noted that after the failed Agia Marina attack he waits for the men to reach the evac point, but by that point barely anyone was left.