Gen 12:3 is directed towards Abram, not the current nation of Israel.
And you might want to consider that some (including the prophet Isaiah, see chapters 30/31) would consider it blasphemeous to think that God needs the US military to defend Israel. This is contrary to the entire Old Testament. Every story tells of Israel standing or falling based on obedience and faithfulness to God. From Moses to Gideon to David, they all won based on faith. Consider Hezekiah. His faith saved him from Sennacherib. 2nd Kings 19:35
That night the angel of the Lord went out and put to death a hundred and eighty-five thousand in the Assyrian camp. When the people got up the next morning—there were all the dead bodies!