The Courier will encounter Paladin Todd arguing with Colonel Cassandra Moore over the NCR's continued use of salvaged power armor. If the player has a Speech skill of 40 or higher they can convince Todd to allow the NCR to continue using the armor during the Hoover Dam battle. Alternatively, the player can convince Moore to voluntarily give up the armor with a Speech skill of 60 or greater, or simply leave the immediate area, which will cause Moore to give an order to "shut Todd up."
PCXbox 360 Sometimes the player cannot initiate a dialogue with Paladin Todd, and receives no speech option with Colonel Moore to convince her to give up the armor, even if the player has a Speech skill of 100. [verified]