After less than four months at the Veterans Affairs Department, Sloan D. Gibson suddenly finds himself in charge of fixing the problems that led to the resignation of VA Secretary Eric Shinseki. "Sloan, I think, would be the first to acknowledge that he's going to have a learning curve that he's got to deal with," President Barack Obama told reporters Friday after announcing that Gibson would replace Shinseki temporarily. A career banker, Gibson was confirmed by the Senate on Feb. 11 as deputy VA secretary, just weeks before allegations of long waits for doctor's appointments at VA hospitals nationwide led...