the mark, brianna. they have moved the 50 marines as close as they can to south sudan so if there also a request, an order from the state department to evacuate americans,ed that be the trigger. then the marines would go in. they can do two things there. they can evacuate americans and at the same time, they can provide additional security and reinforcement for the u.s. embassy in south sudan. right now, nothing else has happened. everything is just sort of status quo for those marines. but there's very much a specter here of wanting to be ready, part of the hangover, the shadow, if you will, of what happened in benghazi libya when a u.s. military forces were not nearby to help out americans in peril. and, of course, really part of it about what happened on saturday when rebels fired at three u.s. aircraft trying to evacuate americans and four navy s.e.a.l.s got badly wounded. this time if they have to go