Demands return of dummy Hellfire missile Congress may consider blocking the United States and Cuba from conducting joint security exercises until the Obama administration can prove the communist regime has dialed back its anti-American efforts, according to a letter sent to the Pentagon and obtained by the Washington Free Beacon.Sen. Ted Cruz (R., Texas), a leading critic of the administration's detente with Cuba, petitioned Secretary of Defense Ash Carter on Wednesday, demanding that he disinvite Cuba from the upcoming Caribbean Nations Security Conference, which will be held later this month in Jamaica. Cruz is concerned about recent reports that Cuba...