Power Armor Training (Fallout 3)

Power Armor Training is a perk in Fallout 3 and Fallout: New Vegas. It allows the player character to equip power armor or a power helmet.

Fallout 3

 * During the Picking Up the Trail, request permission for power armor training from Elder Lyons. Afterward, speak to Paladin Gunny in the Bailey (courtyard) of the Citadel to receive the perk.
 * Automatically gained upon completing The American Dream.
 * Automatically gained upon completing the Anchorage Reclamation simulation (Operation: Anchorage).

Bugs
It is possible to obtain the perk without completing any quests past Escape! There is a mapping bug northwest of the entrance to the Citadel on the Arlington Bridge (The only bridge that fully crosses the Potomac River). There are a few mounds of rubble that one needs to get to the top. The "bald" mound of rubble allows one to fall in, once under the map, working the way to the Citadel by going left when possible. See it in action here.

Fallout: New Vegas

 * After completing the quest Still in the Dark, return to either Nolan McNamara or Edgar Hardin, depending on who is now Elder.
 * If McNamara remains elder, wait 24 hours outside of the bunker for the lockdown to be lifted, then talk to him. Telling him one wishes to join the Brotherhood of Steel will begin the Eyesight to the Blind quest. When this is completed, one will then receive Power Armor Training.
 * If helped Hardin become elder, complete the Tend to Your Business quest.
 * The other option for training is the For Auld Lang Syne quest, given by Arcade Gannon. Once having gathered the Remnants together, the Courier will be provided with the perk, in addition to a suit of Remnants power armor.