When your Speech is at 40, go to Camp Golf, by Lake Las Vegas. Accept the quest from the sergeant. Agree to O'Hanran's method and convince everyone, with Mags being the last. After convincing Mags to play nice, accept her method and go to the gun range. Help them with their guns (45 skill required), and wait for them to start walking back to their tent. Talk to Razz and ask about squadmates. The speech challenge should still be there. You can easily unlock the "Outstanding Orator" achievement or trophy, as well as experience points in increments of 40. When you are done, talk to the sergeant to complete the quest or talk to O'Hanran and ask about the squad. Note: You have the option of helping them with explosives after the guns.