Cradling an AK-47 and sucking a lollipop, the former American Green Beret bumped along in the back of an armored SUV as it wound through the darkened streets of Aden. Two other commandos on the mission were former Navy SEALs. As elite US special operations fighters, they had years of specialized training by the US military to protect America. But now they were working for a different master: a private US company that had been hired by the United Arab Emirates, a tiny desert monarchy on the Persian Gulf.