Helicopters would come pick them up from the airport or embassy if it was necessary. The violence in Yemen started relatively far from the population centers where most expats are&#x2F;were and progressed relatively slowly. They had plenty of time to get out of the country via normal transportation options. If outright combined arms conflict had suddenly erupted in the city, you can bet the various developed militaries of the world would have provided protection for their citizens to leave.<p>Also, a naval vessel absolutely qualifies as evacuating your citizens.