Donating to Fort Hamilton requires you to have power of 15 or more.
You get 1 power if you have 50 or more in melee or ranged skill.
Some hired NPCs give you 1, 3, or 4 power.
Influence, +1 power above each of 600, 1500, 2500, 5k, 10k, 25k, 75k, 100k, 150k, +2 at 50k, 200k
Number of soldiers, NPCs with melee or ranged skill of 40 or more, +1 for MC at 50 skill, give +1 power at each of 10 and 15, +2 at 25, +3 at 50, +4 at 75.
Cash you currently have, +1 power at each of 40k, 70k, 120k, 500k, 1M, 10M, +2 at 100M.
Number of HULC suits you own, +1 power each.
Having something built in the 2 external building slots in Redhaven, +2 power each.
Up to 2 power for business power, increased by some investments in Redhaven Weapon and General store, Stralsund caravan in Imogens Barrow, Aimees store, Belial guns.
Factions if you are their leader (standing 100+) give 1/3 of their power to you, currently possible for Viking/Aesir, Christian, Bandit, and Fort Sera factions, other factions currently limit standing to 70 or you cant increase your standing with them, and religious factions also require you to use their religion.