WASHINGTON, Oct. 19, 2007 – Air cavalry helicopter pilots have had to change their tactics to adapt to newer and higher-tech surface-to-air missile systems that officials believe are coming in from Iran, a senior official in Iraq said today. Crews from 1st Air Cavalry Brigade out of Camp Taji, Iraq, have flown support for operations in and around Baghdad for more than a year. Since their arrival, there has been an increase in the sophistication of attacks and types of weapons, Army Col. Daniel J. Shanahan said in a conference call with military analysts. “In the last several months,...