A dozen American F-22 Raptor fighter jets, representing more than $4 billion of military spending, have arrived at an Israeli air force base amid a massive buildup of US military hardware in the Middle East . The planes, widely considered the best in the world due to their speed and stealth, arrived in the Jewish state Tuesday evening as tensions with Iran soar,  the Jerusalem Post reported . Designed by Lockheed Martin, the F-22s cost around $350 million each, and are so vital to the US that