As a former C-5 pilot, I remember a few truisms. 1: There is no such thing as a ground ???accident???; 2: Good CRM includes LISTENING to all crewmember???s inputs and responding appropriately; 3: CLEAR CLEAR CLEAR; and 4: When in doubt about wingtip clearance ??? Stop taxiing, deploy wing walkers or arrange for a tug (or have the obstacle, including a building, moved!).