already committed significant assistance. the u.s. military is helping the saudis plan bombing missions over yemen, providing targeting intelligence from satellites overhead, and making awacs surveillance planes and aerial refueling aircraft available, as well. the general says he doesn't know if it will all work. >> i don't currently know the specific goals and objectives of the saudi campaign, and i have to know that to be able to assess the likelihood of success. >> reporter: the u.s. military involvement, as sensitive as it gets. saudi arabia is backing beleaguered yemeni president hadi who has fled his country. the rebels are backed by iran. the u.s. worries terror groups will exploit the chaos. >> there's a lot at stake here, particularly with al qaeda and isis both active in yemen. but let's face the facts. the u.s. is involved now in a