(Reuters) - U.S. officials in Libya have begun to look for recruits for a commando force which they plan to train to fight militants, a former commander of Libyan rebels who toppled Muammar Gaddafi said on Tuesday. There was no immediate U.S. comment. After a wave of anti-American violence in the Arab world in September during which the U.S. ambassador to Libya died in an Islamist militant attack, President Barack Obama took measures to improve the security of U.S. diplomatic installations in the region. A team of about 10 Americans from the embassy in Tripoli visited a paramilitary base in...