bagram air base afghanistan u.s. secretary state rex tillerson monday discuss afghan leaders u.s. strategy end america long war brief unreported visit underscore challenge quell country insurgency tillerson spend almost three hours heavily guard build main u.s. military facility afghanistan time talk president ashraf ghani chief executive abdullah abdullah u.s. afghan officials small group u.s. media accompany former exxonmobil ceo first official visit afghanistan prohibit security reason file dispatch photograph video return qatar recent attack airbase taliban insurgents sprawl facility north kabul regularly hit since 2001 u.s. invasion rocket mortar explosives-laden vehicles recent visit kabul u.s. defense secretary jim mattis greet rocket attack city main airport speak brief news conference meet ghani abdullah tillerson say would fly pakistan tuesday reinforce trump administration demand islamabad move taliban extremists base inside border face consequences make specific request pakistan order take action undermine support taliban receive terrorist organizations receive say u.s. policy toward islamabad base upon whether take action feel necessary move process forward create opportunity reconciliation peace afghanistan also ensure stable future pakistan continue tillerson say would travel india discuss request expand economic development assistance afghanistan tillerson pay fly visit afghanistan discuss u.s. strategy