Tap.
Douglas, commander of Fort Norton, is one of the most influential men of this Fort. He is one of the most important militaries in the entire Citadel.
Sure, he wasn't a Phantom, Operator, Harvester, Blacksmith, or Free Scientist. Technically, he was just a middle-aged man who held one of the highest positions in the military part of the Citadel.
But... Douglas had gone through many difficult events, from a simple military man, a common soldier to the commander of a huge Fort where many military and combat equipment were concentrated.
He saw all kinds of deaths, both military and Phantom, and real miracles when people got out alive from impossible situations.
Also, Douglas was aware of many secrets usually inaccessible even to most Phantoms.