Former Republican vice presidential candidate Sarah Palin wrapped up a three-hour book signing by thanking soldiers and shaking their hands at a North Carolina army base.Palin did not give a speech during her stop Monday at fort Bragg, home of the army's 82nd airborne division and green berets.The former Alaska governor promised to limit her enthusiasm after the army worried Palin's appearance would prompt political grandstanding against president Obama.Army officials said more than 1,200 people lined up outside as Palin signed copies of her new memoir, 'Going Rogue.'