By Ahmed Hagagy, Jana Choukeir and Phil Stewart KUWAIT CITY, March 2 (Reuters) - Kuwait's air defences mistakenly shot down three U.S. F-15 fighter jets during active combat on Monday, U.S. Central Command said on Monday, describing it as an apparent friendly-fire incident during the conflict with Iran. All six crew members ejected from the aircraft safely, were recovered and are in stable condition, CENTCOM said.