Watch Your Step! By Lori Yerdon, U.S. Army Combat Readiness/Safety Center, Fort Rucker, Ala. March 28, 2012 Share on Twitter; Share on Facebook; Share on Reddit; Share on LinkedIn ...

Biden's latest stumble comes days after some questioned why a "watch your step" sign was spotted on the stairs leading up to Air Force One during Biden's arrival in the U.K. on Sunday night.