BEIJING, Feb. 6 (Xinhua) The United States and Britain Saturday night launched joint airstrikes on Houthi militia targets in Yemen, the third time in two weeks. Just the day before, the U.S. military also carried out airstrikes on over 85 targets in Iraq and Syria related to Iran's Islamic Revolutionary Guards Corps (IRGC) and affiliated militia groups in retaliation for a drone strike that killed three U.S. soldiers in Jordan on Jan. 28. WHY SO MANY U.S. STRIKES? Since the outbreak of the