likely shanahan will be in place when nato has summits in february in brussels. what's shanahan going to do? how will he convince allies they are, indeed, the u.s. is committed to the nato alliance. >> jim mattis wanted to stay in place for. obviously leaving early. as the year comes to a close we want to reflect on those who served, including those who lost their lives on the front lines, serving every single day. how does 2018 compare in terms of u.s. troops lost in combat? >> reporter: slightly more than 2017, so in total there were 23 americans who died in combat from somalia, afghanistan, iraq and syria. 13 in afghanistan which is slightly up from last year. nowhere near the numbers we saw in 2010, 2011 at the height of the obama surge. the deadliest single event ended up being that helicopter crash in iraq, the helicopter went