Israel is now operating in the Gaza Strip, but a U.S. official says IDF ground invasion plans changed to use more “methodical” tactics compared to original plans. But still, Israel’s air campaign has been relentless, turning parts of Gaza into moonscapes. Nick Schifrin discussed more with retired IDF Maj. Gen. Yaakov Amidror and Frederic Wehrey of the Carnegie Endowment for International Peace.