Newt Gingrich criticized Republican rival Rick Santorum on Tuesday afternoon for his “complete misunderstanding of modern warfare” over the former Pennsylvania senator’s remarks on women in combat. Santorum on Thursday said he had “concerns about women in frontline combat.” “I think that could be a very compromising situation … where people naturally, you know, may do things that may not be in the interests of the mission because of other types of emotions that are involved,” Santorum told CNN’s John King. Gingrich fired back at Santorum, calling his credentials to be commander in chief into question during a press availability...