The Admiral is the former right-hand man of Roman, the leader of the Children of the Forest. The two came to a disagreement about how to deal with the mutants. The Admiral wanted to occupy the local mill to better defend the valley, but the others thought it too dangerous due to radiation levels in the building. The Admiral was outvoted, but still set out for the Mill to carry out his plan, though few joined him. At some point, the Admiral got crippled and was forced to use a wheelchair, though it is unclear if this was before or after he moved to the Mill, or even before the bombs fell. Overtime, the Admiral became mentally unstable, as after his comrades died he continued pretending they're alive, even having conversations with them. What’s more, in his monologue he mentions that his comrades wanted to leave and only the triple dose of his ‘tea’ stopped them. Given that said tea has a clear sleep-inducing effect, the Admiral either purposefully or accidentally poisoned his team and may have gone insane because of that.